Pregnancy Week by Week Tracker
Select your week to see how big your baby is, what's developing, what symptoms to expect, and what you should be doing.
🫐
Week 12
First Trimester
Baby is the size of a plum
👶 Baby's development
- •Baby's reflexes are developing — fingers open and close, toes curl
- •The brain is developing rapidly — nerve cells multiply fast
- •Baby's intestines, which grew into the umbilical cord, are moving into the abdomen
🤰 Mom's symptoms
- •End of first trimester — risk of miscarriage drops significantly
- •Dizziness from expanding blood volume and lower blood pressure
- •Dark line (linea nigra) may appear on the belly
✅ This week's to-do
- •Get the NT scan / first-trimester screening if scheduled
- •Many parents choose to announce the pregnancy this week
- •Start light exercise like prenatal yoga or swimming
Size and weight are approximate averages. Every pregnancy is different. Consult your healthcare provider for personalized guidance.
How this tracker works
Our week-by-week pregnancy tracker provides medically reviewed information for each of the 42 weeks of pregnancy. The data includes baby's approximate size (with fun fruit comparisons), weight and length, key developmental milestones, common symptoms you may experience, and an actionable to-do list for each week.
Baby size data is based on averages from the World Health Organization (WHO) and American College of Obstetricians and Gynecologists (ACOG) growth charts.
Every pregnancy is unique. This tool is for general guidance only — always consult your healthcare provider for advice specific to your pregnancy.
This tool is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider or OB-GYN with any questions about your pregnancy.