Fetal development in 4th month.

The fetus can even suck its thumb, yawn, stretch and make faces.

Week 13: Vocal cords form and  fetus’s large head begins to grow proportionate to its body.

Week 14: The fetus’s skin starts to thicken and fine hair begins to grow.

1. Hair, eyelids, eyelashes, and nails become well developed.
2. The heartbeat is now clearly audible through a Doppler instrument.
3. The teeth become denser, and the baby begins to stretch, yawn and make other movements.
4. The reproductive organs are now visible on an ultrasound.