Bones strengthen but remain flexible for birth. The fetus gains about 1/2 pound this week. Eat calcium-rich foods.
Week 12 - End of First Trimester
Week 20 - Halfway Point
Implantation calculator
Week 37 - Full-Term Begins
Cycle Phase Overview
Week 4 - Neural Tube Development
Symptom Alert System
Week 25 - Brain Growth Spurt