Title: Early Pregnancy Fetal Development
Headings: Early Pregnancy Fetal Development
Early Pregnancy Fetal Development
Early Pregnancy
4 Weeks of Pregnancy
7 Week Embryo
8 Week Fetus
10 Week Fetus
12 Week Fetus
16 Week Fetus
24 Week Fetus
26-28 Week Fetus
30-39 Week Fetus

Content: pronephros, mesonephros and metanephros. During the fourth week, the first stage (pronephros) disappears so that the second stage (mesonephros) can begin forming. 5 ﻿
3
7 Week Embryo
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The hand plates become present this week, and the baby is about 1.5 centimeters crown-rump length (CRL) by the end of the week (at the start of the eighth week). 6 ﻿ The genital tubercle is present, but you can't distinguish the sex by sight at this point. Nasal pits are also forming. 7 ﻿
Bones and joints this week have many things going on. The process of ossification (hardening of the bones) begins. 8 ﻿
With a transvaginal ultrasound, one study shows that over 90 percent of ultrasounds will show a fetal pole with heart motion. 4
8 Week Fetus
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The embryo now enters the fetal period. Your baby will be about 2.2 centimeters long at the end of the eighth week (and at the start of the ninth).