Week 31

Fetal Development:
Growth begins to slow a teeny bit, and the brain goes through a period of rapid development. The only major organ left to fully develop is the lungs. If your baby is a boy, his testes begin to descend from the body cavity to the scrotum.

Maternal Changes:
Your abdomen may be aching frequently now as your uterus is stretching more and more. Your uterus is about 4 1/2 inches above your belly button with ten weeks to go.
Seventh Month
As your baby's bones harden and grow, your calcium needs are even greater. Be sure your diet is adequate in calcium, protein, iron and folic acid