The Baby’s Development – Week 21

Though it has no body fat at this point, it will gain more weight in the next few weeks, and by week 25, it will weigh almost twice as much.
The motions, or “quickening,” are increased leg and arm activity because of muscular development.
It’s respiratory system is still immature and requires much more development.
As it swallows amniotic fluid, it’s body will absorb the water from the fluid and the rest will go into it’s large bowel.

Source: Valley Medical Center, Weekly Parenting Email