Embryo - Fourth Month

Facial expressions start to resemble those of their parents. Vocal cords and external sex organs become visible, and this is the earliest stage where gender can start to be determined. The baby can now hear sounds very clearly.

-Week 16: Mothers to be may start to feel their baby's first movements. Eyelashes become present, and rapid eye movement (REM), indicating dreaming, can start to be recorded in your baby. Braxton Hicks contracts can start to be felt around 16 weeks for first-time pregnancies. But some mothers don't feel them at all.

Braxton Hicks contractions are sporadic contractions and relaxation of the uterine muscle. Sometimes, they are referred to as prodromal or "false labor" pains.

-Week 17: Baby's hearing is making big strides this week. Their ears are close to being fully formed.

-Week 18: Fingerprints are developed on your baby, and Myelin, protective insulation, has started to form around baby's nervous, keeping them safe until they are born.

Go back to Baby's Development In The Womb