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Fetal Development Week By Week What Your Baby Looks Like

4 min


At the miraculous moment of fertilization – when the egg of a woman and the sperm of a man unite, a new human life begins. From this moment on, it will take approximately nine months for the baby to develop and be ready to be born.

Only 5 % of the babies are born exactly on their due dates. The long awaited day is near and soon you will be holding your baby in your arms. Your baby has lost his lanugo hair although you may still find some at his back and on his forehead. 

Your baby’s eyes will be blue at birth but this can change in the weeks to come. Some babies arrive a bit earlier, others a bit later, but they do arrive! So, much luck and happiness with the new baby in your life!

The average baby will be about 7.5 pounds (3.4 kilograms) and 20 inches long at birth. The placenta will weigh about one eighth the size of the baby and the umbilical cord will be about the same length as the baby. 

Embryo, 3 to 4 weeks. A 6mm embryo is identified which shows a possible heart bulge on the anterior surface. No limb bud is seen. (Photos: Lunar Caustic)

An embryo from an ectopic pregnancy which is approximately 3 to 4 weeks estimated gestational age from conception. It was 0.5 cm long. See larger view for detail.

Embryo at 4 to 5 weeks. This is an embryo at approximately 4 to 5 weeks from conception. This was an ectopic pregnancy in a fallopian tube.

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