The month by month development of your baby is truly exciting and dramatic. Understanding exactly how the fetus grows will help you establish a relationship with your child even before birth.
During pregnancy, the trimesters are the major milestones of the mother-to-be.
The first trimester is from week 1 to the end of week 12 the second trimester is from week 13 to the end of week 26 the third trimester is from week 27 to the end of the pregnancy.
During the first 3 months you will probably gain approximately 2-4 lb, if nausea hasn’t been a problem. During the second 3 months, you will probably gain approximately 12 lb. During the final months, you will probably gain approximately 10 lb.