Approximately 7 weeks after conception
Week 1: Baby attaches to the uterus
Week 2: Rapid development occurs
Week 3: Heart starts beating
Week 4: Brain and spinal cord developing
Week 5: Facial features are visible; Hands and feet forming
Week 6: About 3/4 inch tall; Brain waves measurable; Fingers and toes forming
Week 7: Baby coordinates movements and sucks thumb; Genitals forming
Week 8: About 1 1/2 inches tall; Pain felt; All organs functioning
Weeks 9-12: About 3 1/2 inches tall; Baby can smile, sleep, wake and clasp hands
