4
Week
Baby Size
Poppy seed - 0.1 cm
Baby Development
- The blastocyst implants in the uterine lining
- The placenta begins to form
- Amniotic sac starts developing
Changes in Your Body
- Light spotting may occur
- Breast tenderness may begin
- Fatigue is common
Tips for This Week
Tip of the Week
Start taking prenatal vitamins if you haven't already. Focus on getting enough folic acid.