742:
557:
302:
465:
51:, in contrast measures the actual age of the embryo or fetus from the time of fertilization. Nevertheless, menstruation has historically been the only means of estimating embryonal/fetal age, and is still the presumed measure if not else specified. However, the actual duration between last menstruation and fertilization may in fact differ from the standard 2 weeks by several days.
1118:
888:
723:
294:
57:
Furthermore, the number of the week is one more than the actual age of the embryo/fetus. For example, the embryo is 0 whole weeks old during the 1st week after fertilization.
219:
If separation into identical twins occurs, 2/3 of the time it will happen between days 5 and 9. If it happens after day 9, there is a significant risk of the twins being
1266:
1581:
1518:
1395:
1592:
1529:
1406:
1293:
1304:
198:
Trophoblast cells surrounding the embryonic cells proliferate and invade deeper into the uterine lining. They will eventually form the
1570:
1556:
1545:
1507:
1384:
41:
is the time that has passed since the onset of the last menstruation, which generally or as standard occurs 2 weeks before the actual
1282:
1577:(large image of fetus at 38 weeks after fertilization). Retrieved 2007-08-28. A rotatable 3D version of this photo is available
1514:(large image of fetus at 18 weeks after fertilization). Retrieved 2007-08-28. A rotatable 3D version of this photo is available
1391:(large image of fetus at 10 weeks after fertilization). Retrieved 2007-08-28. A rotatable 3D version of this photo is available
1289:(large image of fetus at 4 weeks after fertilization). Retrieved 2007-08-28. A rotatable 3D version of this photo is available
1250:
1221:
568:
is attached). The features are consistent with a developmental age of seven weeks (reckoned as the ninth week of pregnancy).
741:
1466:"Sonographic early fetal gender assignment: a longitudinal study in pregnancies after in vitro fertilization"
441:
289:
Primitive heart tube is forming. Vasculature begins to develop in embryonic disc. (day 20 of fertilization.)
437:
47:
164:
1425:"Accuracy of first-trimester ultrasound in the diagnosis of early embryonic demise: a systematic review"
1236:
309:, still in the oviduct. This embryo is about five weeks old (or from the seventh week of menstrual age).
877:
647:
Gestational age: 8 weeks and 0 days until 8 weeks and 6 days old. 57–63 days from last menstruation.
577:
Gestational age: 7 weeks and 0 days until 7 weeks and 6 days old. 50–56 days from last menstruation.
477:
Gestational age: 6 weeks and 0 days until 6 weeks and 6 days old. 43–49 days from last menstruation.
318:
Gestational age: 5 weeks and 0 days until 5 weeks and 6 days old. 36–42 days from last menstruation.
244:
Gestational age: 4 weeks and 0 days until 4 weeks and 6 days old. 29–35 days from last menstruation.
191:
Gestational age: 3 weeks and 0 days until 3 weeks and 6 days old. 22–28 days from last menstruation.
116:
Gestational age: 2 weeks and 0 days until 2 weeks and 6 days old. 15–21 days from last menstruation.
1321:
1614:
403:
1030:
The respiratory system, while immature, has developed to the point where gas exchange is possible.
696:
60:
The following table summarizes the various expression systems during week number x of gestation.
491:
1578:
1515:
1392:
1027:
in neural portion of the auditory system will continue to develop until 18 months after birth.
1589:
1526:
1403:
1290:
1113:
A baby born at 36 weeks has a high chance of survival, but may require medical interventions.
668:
556:
1301:
1567:
1504:
1381:
153:
54:
Thus, the first week of embryonic age is already week three counting with gestational age.
1279:
8:
1343:"Degradation phase of apoptosis during the early stages of human metanephros development"
28:
1260:
981:
537:
232:
1487:
1482:
1465:
1446:
1364:
1246:
1239:
1217:
561:
508:
409:
345:
306:
202:
and embryonic membranes. The blastocyst is fully implanted day 7–12 of fertilization.
138:
134:
1477:
1436:
1354:
628:
427:
226:
1098:
The fetus weighs about 2.5 to 3 kg (6 lb 10 oz)to 6 lb 12 oz).
152:
cells and a clump of cells at one end known as the "embryonic pole" which include
1596:
1585:
1574:
1533:
1522:
1511:
1410:
1399:
1388:
1308:
1297:
1286:
1237:
Scott F. Gilbert; with a chapter on plant development by Susan R. Singer (2000).
1137:
The fetus is considered full-term at the end of the 39th week of gestational age.
703:
383:
220:
179:
1010:
965:
873:
807:
795:
754:
710:
484:
The embryo measures 8 mm (0.31 in) in length and weighs about 1 gram.
417:
213:
160:
301:
1608:
678:
621:
565:
512:
487:
339:
42:
468:
A six-week embryonic age or eight-week gestational age intact human embryo.
338:
The heart bulges, further develops, and begins to beat in a regular rhythm.
119:
Embryonic age: Week nr 1. 0 (whole) weeks old. 1–7 days from fertilization.
1491:
1450:
1368:
457:
258:
975:
933:
850:
More muscle tissue and bones have developed, and the bones become harder.
685:
544:
445:
413:
360:
265:
168:
149:
1359:
1342:
1150:
1076:
926:
635:
273:
142:
1441:
1424:
650:
Embryonic age: Week nr 7. 6 weeks old. 43–49 days from fertilization.
580:
Embryonic age: Week nr 6. 5 weeks old. 36–42 days from fertilization.
480:
Embryonic age: Week nr 5. 4 weeks old. 29–35 days from fertilization.
321:
Embryonic age: Week nr 4. 3 weeks old. 22–28 days from fertilization.
247:
Embryonic age: Week nr 3. 2 weeks old. 15–21 days from fertilization.
971:
760:
501:
495:
255:
forms in the center of the embryonic disk. (day 16 of fertilization.)
252:
1117:
887:
826:
Gestational age: 12 weeks and 0 days until 15 weeks and 6 days old.
722:
194:
Embryonic age: Week nr 2. 1 week old. 8–14 days from fertilization.
1058:
1055:
Rhythmic breathing movements occur, but lungs are not fully mature.
929:" usually occurs (the mother and others can feel the fetus moving).
866:
859:
735:
Gestational age: 9 weeks and 0 days until 11 weeks and 6 days old.
533:
421:
371:
293:
283:
206:
199:
1095:
The fetus reaches a length of about 40–48 cm (16–19 in).
1046:
The fetus reaches a length of about 38–43 cm (15–17 in).
829:
Embryonic age: 10 weeks and 0 days until 13 weeks and 6 days old.
667:
Fetal heart tone (the sound of the heart beat) can be heard using
123:
Fertilization of the ovum to form a new human organism, the human
1072:
1020:
776:
The external features of the ear begin to take their final shape.
393:
377:
131:
785:
The eyelids close and will not reopen until about the 27th week.
738:
Embryonic age: 7 weeks and 0 days until 9 weeks and 6 days old.
1101:
1024:
910:
883:
At week 15, main development of external genitalia is finished.
837:
770:
674:
464:
451:
431:
279:
172:
137:, but does not increase in size. This mitosis is also known as
124:
24:
1130:
Gestational age: 35 and 0 days until 39 weeks and 6 days old.
1464:
Mazza V, Falcinelli C, Paganelli S, et al. (June 2001).
811:
788:
564:, this one in the cornu (the part of the uterus to which the
529:
397:
269:
1322:"7 Weeks Pregnant – Symptoms, Fetal Development, Tips"
1068:
922:
The fetus is more active with increased muscle development.
844:
833:
The fetus reaches a length of about 15 cm (6 in).
611:
607:
597:
522:
387:
353:
349:
1143:
The lanugo is gone except on the upper arms and shoulders.
1064:
Bones are fully developed, but are still soft and pliable.
750:
Embryo measures 30–80 mm (1.2–3.1 in) in length.
1049:
The fetus weighs about 1.5 kg (3 lb 5 oz).
689:
518:
367:
1463:
1140:
It may be 48 to 53 cm (19 to 21 in) in length.
1003:
The fetus weighs about 650 g (1 lb 7 oz).
1000:
The fetus reaches a length of 32.5 cm (13 in).
617:
The hands and feet have digits, but may still be webbed.
547:, precursor of the definitive kidney, starts to develop.
335: in) in length and begins to curve into a C shape.
1340:
952:
The fetus reaches a length of 28 cm (11 in).
1061:
brain connections, which mediate sensory input, form.
907:
The fetus reaches a length of 20 cm (8 in).
182:
occurs, 1/3 of the time it will happen before day 5.
33:
1347:
Biomed Pap Med Fac Univ
Palacky Olomouc Czech Repub
1341:Wagner F, Erdösová B, Kylarová D (December 2004).
1238:
779:The head comprises nearly half of the fetus' size.
717:
532:moves through primitive vessels connecting to the
1416:
1211:
1606:
1133:Embryonic age: Weeks nr 34–38. 33–37 weeks old.
18:
1013:develops enough to control some body functions.
695:Spontaneous limb movements may be detected by
791:buds, which will form the baby teeth, appear.
1265:: CS1 maint: multiple names: authors list (
1110:Fingernails reach the end of the fingertips.
348:, grooves which will form structures of the
801:The fetus can make a fist with its fingers.
550:The initial stomach differentiation begins.
159:The embryo hatches from its protein shell (
148:The blastocyst contains only a thin rim of
1481:
1440:
1358:
1207:
1205:
1203:
1201:
1199:
1197:
1195:
1193:
1191:
1189:
1091:Embryonic age: Week nr 33. 32 weeks old.
1052:The amount of body fat rapidly increases.
1042:Embryonic age: Week nr 29. 28 weeks old.
996:Embryonic age: Week nr 25. 24 weeks old.
434:and urinary passageways become separated.
1245:. Sunderland, Mass: Sinauer Associates.
1187:
1185:
1183:
1181:
1179:
1177:
1175:
1173:
1171:
1169:
1116:
961:All of the eye components are developed.
932:The fetal heartbeat can be heard with a
886:
856:Sucking motions are made with the mouth.
817:Heartbeat can be detected by ultrasound.
740:
721:
555:
463:
300:
292:
1429:Ultrasound in Obstetrics and Gynecology
958:Eyebrows and eyelashes are well formed.
1607:
1121:Fetus at 38 weeks after fertilization.
891:Fetus at 18 weeks after fertilization.
297:Embryo at 4 weeks after fertilization.
1557:Pregnancy Calendar: 25 Weeks Pregnant
1546:Pregnancy Calendar: 25 Weeks Pregnant
1166:
1156:Head hair is now coarse and thickest.
1146:Fingernails extend beyond fingertips.
726:Fetus at 8 weeks after fertilization.
261:commences. (day 16 of fertilization.)
1422:
1216:. Edinburgh: Churchill Livingstone.
804:Genitals appear well differentiated.
766:Facial features continue to develop.
229:develops. (day 13 of fertilization).
145:stage. (day 1.5–3 of fertilization.)
141:. A hollow cavity forms marking the
606:Arms and legs have lengthened with
406:ruptures. This is the future mouth.
212:The embryonic cells flatten into a
13:
1067:The fetus begins storing a lot of
286:, form. (day 20 of fertilization.)
276:appear. (day 18 of fertilization.)
268:) forms over the notochord with a
235:appear. (day 13 of fertilization).
14:
1626:
1125:
919:Nails appear on fingers and toes.
853:The fetus makes active movements.
821:
730:
525:form as flat paddles on the arms.
494:form the start of the developing
34:Gestational age vs. embryonic age
1483:10.1046/j.1469-0705.2001.00421.x
984:(air sacs) are forming in lungs.
862:is made in the intestinal tract.
654:The embryo measures 18 mm (
584:The embryo measures 13 mm (
1561:
1550:
1539:
1088:Gestational age: 34 weeks old.
1039:Gestational age: 30 weeks old.
993:Gestational age: 24 weeks old.
945:Gestational age: 22 weeks old.
900:Gestational age: 20 weeks old.
603:The brain continues to develop.
396:plate, the first traits of the
325:The embryo measures 4 mm (
1498:
1457:
1375:
1334:
1314:
1273:
1230:
1023:are now developed, though the
916:Eyebrows and eyelashes appear.
282:, the divisions of the future
1:
1160:
948:Embryonic age: 20 weeks old.
903:Embryonic age: 18 weeks old.
718:Changes by weeks of gestation
175:. (day 5–6 of fertilization.)
19:Changes by weeks of gestation
1588:, and a sketch is available
1525:, and a sketch is available
1402:, and a sketch is available
1300:, and a sketch is available
955:The fetus weighs about 500g.
560:This embryo is also from an
7:
1423:Jeve, Y (13 October 2011).
1016:The eyelids open and close.
1006:The brain develops rapidly.
10:
1631:
1212:William J. Larsen (2001).
1153:are present on both sexes.
1083:
1034:
988:
940:
895:
430:begins to form. Thus, the
386:, the first traits of the
127:. (day 1 of fertilization)
22:
1595:27 September 2007 at the
1584:16 September 2007 at the
1573:27 September 2007 at the
1532:27 September 2007 at the
1521:16 September 2007 at the
1510:27 September 2007 at the
1470:Ultrasound Obstet Gynecol
1409:27 September 2007 at the
1398:16 September 2007 at the
1387:27 September 2007 at the
1307:27 September 2007 at the
1296:14 September 2007 at the
1285:27 September 2007 at the
964:The fetus has a hand and
878:obstetric ultrasonography
869:produce fluid secretions.
642:
624:begins to be perceptible.
572:
507:The brain divides into 5
472:
313:
239:
186:
111:
880:is almost 100% accurate.
782:The face is well formed.
757:fuse during the 8th week
420:, which will become the
412:, which will become the
404:Buccopharyngeal membrane
264:A neural groove (future
913:covers the entire body.
380:and a tail are visible.
171:lining of the mother's
1122:
892:
847:is almost transparent.
746:
727:
614:areas distinguishable.
569:
511:, including the early
469:
310:
305:A 10mm embryo from an
298:
1241:Developmental biology
1120:
890:
840:develops on the head.
744:
725:
559:
467:
444:differentiate in the
418:dorsal pancreatic bud
304:
296:
130:The zygote undergoes
1104:begins to disappear.
810:are produced in the
706:have at least begun.
664: in) in length.
634:Main development of
594: in) in length.
154:embryonic stem cells
1360:10.5507/bp.2004.054
1107:Body fat increases.
836:A fine hair called
773:are more developed.
753:Ventral and dorsal
538:chorionic membranes
410:Cystic diverticulum
178:If separation into
29:Human embryogenesis
1123:
893:
798:are long and thin.
747:
728:
631:begins to develop.
570:
470:
311:
299:
272:bulge at one end.
233:Primary stem villi
216:, two cells thick.
135:cellular divisions
1442:10.1002/uog.10108
1252:978-0-87893-243-6
1223:978-0-443-06583-5
978:continue forming.
745:Fetus at 10 weeks
562:ectopic pregnancy
370:begin to form as
346:Pharyngeal arches
307:ectopic pregnancy
205:Formation of the
109:
108:
1622:
1600:
1565:
1559:
1554:
1548:
1543:
1537:
1502:
1496:
1495:
1485:
1461:
1455:
1454:
1444:
1420:
1414:
1379:
1373:
1372:
1362:
1338:
1332:
1331:
1329:
1328:
1318:
1312:
1277:
1271:
1270:
1264:
1256:
1244:
1234:
1228:
1227:
1214:Human embryology
1209:
713:normally closes.
684:Location of the
663:
662:
658:
629:lymphatic system
593:
592:
588:
428:Urorectal septum
334:
333:
329:
227:Primitive streak
63:
62:
1630:
1629:
1625:
1624:
1623:
1621:
1620:
1619:
1615:Human pregnancy
1605:
1604:
1603:
1597:Wayback Machine
1586:Wayback Machine
1575:Wayback Machine
1566:
1562:
1555:
1551:
1544:
1540:
1534:Wayback Machine
1523:Wayback Machine
1512:Wayback Machine
1503:
1499:
1462:
1458:
1421:
1417:
1411:Wayback Machine
1400:Wayback Machine
1389:Wayback Machine
1380:
1376:
1339:
1335:
1326:
1324:
1320:
1319:
1315:
1309:Wayback Machine
1298:Wayback Machine
1287:Wayback Machine
1278:
1274:
1258:
1257:
1253:
1235:
1231:
1224:
1210:
1167:
1163:
1128:
1086:
1037:
991:
943:
898:
824:
808:Red blood cells
755:pancreatic buds
733:
720:
660:
656:
655:
645:
590:
586:
585:
575:
475:
442:posterior horns
331:
327:
326:
316:
242:
189:
180:identical twins
163:) and performs
114:
78:
70:
39:Gestational age
36:
31:
21:
12:
11:
5:
1628:
1618:
1617:
1602:
1601:
1560:
1549:
1538:
1497:
1456:
1435:(5): 489–496.
1415:
1374:
1333:
1313:
1272:
1251:
1229:
1222:
1164:
1162:
1159:
1158:
1157:
1154:
1147:
1144:
1141:
1138:
1127:
1126:Weeks 36 to 40
1124:
1115:
1114:
1111:
1108:
1105:
1099:
1096:
1085:
1082:
1081:
1080:
1065:
1062:
1056:
1053:
1050:
1047:
1036:
1033:
1032:
1031:
1028:
1025:myelin sheaths
1017:
1014:
1011:nervous system
1007:
1004:
1001:
990:
987:
986:
985:
979:
969:
966:startle reflex
962:
959:
956:
953:
942:
939:
938:
937:
930:
923:
920:
917:
914:
908:
897:
894:
885:
884:
881:
874:sex prediction
872:From week 13,
870:
865:The liver and
863:
857:
854:
851:
848:
841:
834:
823:
822:Weeks 13 to 16
820:
819:
818:
815:
805:
802:
799:
792:
786:
783:
780:
777:
774:
767:
764:
758:
751:
732:
731:Weeks 10 to 12
729:
719:
716:
715:
714:
711:vitelline duct
707:
702:All essential
700:
693:
682:
681:begin to form.
679:hair follicles
672:
665:
644:
641:
640:
639:
632:
625:
618:
615:
604:
601:
600:begin to form.
595:
574:
571:
566:Fallopian tube
552:
551:
548:
541:
526:
521:buds form and
516:
505:
499:
488:Optic vesicles
485:
474:
471:
462:
461:
455:
449:
435:
425:
407:
401:
391:
381:
375:
364:
357:
343:
336:
315:
312:
291:
290:
287:
277:
262:
256:
241:
238:
237:
236:
230:
224:
217:
210:
203:
188:
185:
184:
183:
176:
161:zona pellucida
157:
146:
128:
113:
110:
107:
106:
103:
100:
94:
93:
90:
87:
81:
80:
79:(whole weeks)
73:
66:
35:
32:
20:
17:
9:
6:
4:
3:
2:
1627:
1616:
1613:
1612:
1610:
1598:
1594:
1591:
1587:
1583:
1580:
1576:
1572:
1569:
1564:
1558:
1553:
1547:
1542:
1535:
1531:
1528:
1524:
1520:
1517:
1513:
1509:
1506:
1501:
1493:
1489:
1484:
1479:
1475:
1471:
1467:
1460:
1452:
1448:
1443:
1438:
1434:
1430:
1426:
1419:
1412:
1408:
1405:
1401:
1397:
1394:
1390:
1386:
1383:
1378:
1370:
1366:
1361:
1356:
1352:
1348:
1344:
1337:
1323:
1317:
1310:
1306:
1303:
1299:
1295:
1292:
1288:
1284:
1281:
1276:
1268:
1262:
1254:
1248:
1243:
1242:
1233:
1225:
1219:
1215:
1208:
1206:
1204:
1202:
1200:
1198:
1196:
1194:
1192:
1190:
1188:
1186:
1184:
1182:
1180:
1178:
1176:
1174:
1172:
1170:
1165:
1155:
1152:
1148:
1145:
1142:
1139:
1136:
1135:
1134:
1131:
1119:
1112:
1109:
1106:
1103:
1100:
1097:
1094:
1093:
1092:
1089:
1078:
1074:
1070:
1066:
1063:
1060:
1057:
1054:
1051:
1048:
1045:
1044:
1043:
1040:
1029:
1026:
1022:
1018:
1015:
1012:
1008:
1005:
1002:
999:
998:
997:
994:
983:
980:
977:
973:
970:
967:
963:
960:
957:
954:
951:
950:
949:
946:
935:
931:
928:
924:
921:
918:
915:
912:
909:
906:
905:
904:
901:
889:
882:
879:
875:
871:
868:
864:
861:
858:
855:
852:
849:
846:
842:
839:
835:
832:
831:
830:
827:
816:
813:
809:
806:
803:
800:
797:
793:
790:
787:
784:
781:
778:
775:
772:
768:
765:
762:
759:
756:
752:
749:
748:
743:
739:
736:
724:
712:
708:
705:
701:
698:
694:
691:
687:
683:
680:
676:
673:
670:
666:
653:
652:
651:
648:
637:
633:
630:
626:
623:
622:gonadal ridge
619:
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583:
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513:telencephalon
510:
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459:
458:Ureteric buds
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340:Septum primum
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55:
52:
50:
49:
48:Embryonic age
44:
43:fertilization
40:
30:
26:
16:
1568:3D Pregnancy
1563:
1552:
1541:
1505:3D Pregnancy
1500:
1476:(6): 513–6.
1473:
1469:
1459:
1432:
1428:
1418:
1382:3D Pregnancy
1377:
1353:(2): 255–6.
1350:
1346:
1336:
1325:. Retrieved
1316:
1280:3D Pregnancy
1275:
1240:
1232:
1213:
1132:
1129:
1090:
1087:
1041:
1038:
995:
992:
976:fingerprints
947:
944:
902:
899:
828:
825:
737:
734:
692:are visible.
649:
646:
579:
576:
553:
528:Rudimentary
479:
476:
320:
317:
259:Gastrulation
246:
243:
193:
190:
165:implantation
118:
115:
97:
84:
75:
68:
59:
56:
53:
46:
38:
37:
15:
1151:breast buds
934:stethoscope
545:metanephros
446:spinal cord
414:gallbladder
361:neural tube
266:spinal cord
169:endometrial
150:trophoblast
85:Gestational
76:Initial age
1327:2016-07-18
1161:References
1077:phosphorus
972:Footprints
927:Quickening
761:Intestines
697:ultrasound
636:sex organs
502:Nasal pits
492:optic cups
274:Neuromeres
143:blastocyst
23:See also:
1261:cite book
372:otic pits
253:notochord
221:conjoined
167:onto the
98:Embryonic
1609:Category
1593:Archived
1582:Archived
1571:Archived
1530:Archived
1519:Archived
1508:Archived
1492:11422974
1451:21997875
1407:Archived
1396:Archived
1385:Archived
1369:15744391
1305:Archived
1294:Archived
1283:Archived
1059:Thalamic
1021:cochleae
867:pancreas
860:Meconium
534:yolk sac
509:vesicles
454:appears.
438:Anterior
422:pancreas
384:Lung bud
378:Arm buds
342:appears.
284:vertebra
207:yolk sac
200:placenta
139:cleavage
1084:Week 35
1073:calcium
1035:Week 31
989:Week 26
982:Alveoli
941:Week 23
896:Week 21
771:eyelids
763:rotate.
675:Nipples
669:doppler
659:⁄
638:starts.
589:⁄
460:appear.
424:appear.
400:appear.
394:Hepatic
390:appear.
363:closes.
356:, form.
330:⁄
280:Somites
132:mitotic
1490:
1449:
1367:
1249:
1220:
1149:Small
1102:Lanugo
911:Lanugo
843:Fetal
838:lanugo
704:organs
686:elbows
643:Week 9
573:Week 8
473:Week 7
452:Spleen
432:rectal
416:, and
314:Week 6
240:Week 5
187:Week 4
173:uterus
125:zygote
112:Week 3
71:number
25:Embryo
812:liver
796:limbs
789:Tooth
598:Lungs
530:blood
523:hands
504:form.
398:liver
270:brain
69:Week
1590:here
1579:here
1527:here
1516:here
1488:PMID
1447:PMID
1404:here
1393:here
1365:PMID
1302:here
1291:here
1267:link
1247:ISBN
1218:ISBN
1075:and
1069:iron
1019:The
1009:The
974:and
845:skin
794:The
769:The
709:The
690:toes
688:and
677:and
627:The
620:The
612:hand
610:and
608:foot
543:The
536:and
490:and
440:and
388:lung
368:ears
366:The
359:The
354:neck
352:and
350:face
214:disk
105:x-3
92:x-1
27:and
1478:doi
1437:doi
1355:doi
1351:148
876:by
519:Leg
496:eye
102:x-2
1611::
1486:.
1474:17
1472:.
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1263:}}
1259:{{
1168:^
1071:,
251:A
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657:3
591:2
587:1
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448:.
374:.
332:8
328:1
223:.
209:.
156:.
89:x
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