Pregnancy Week by Week
Your complete guide to every week of pregnancy. Evidence-based information about your baby's development, your changing body, and what to expect next.
First Trimester
Weeks 1–13: The foundation is set. Major organs begin forming.
The Cycle Begins
ReadOvulation
ReadFertilization
ReadImplantation
ReadThe Heart Beats
ReadThe Face Takes Shape
ReadFingers and Toes
ReadAll Basic Organs Formed
ReadEmbryo Becomes Fetus
ReadFingers Fully Developed
ReadBaby Is on the Move
ReadEnd of the First Trimester!
ReadThe Second Trimester Begins
ReadSecond Trimester
Weeks 14–26: The golden trimester. Baby grows rapidly and you feel movement.
Facial Expressions
ReadBaby Can Hear You
ReadCoordinated Movements
ReadFat Storage Begins
ReadBaby Is Yawning
ReadVernix Is Forming
ReadHalfway There!
ReadMovements Are Clear
ReadEyebrows Are Visible
ReadLung Maturation Begins
ReadViable Outside the Womb
ReadYour Baby Recognizes Voices
ReadEyes Open for the First Time
ReadThird Trimester
Weeks 27–40: The final stretch. Baby prepares for life outside the womb.
Last Week of the Second Trimester
ReadWelcome to the Third Trimester!
ReadYour Baby Is Gaining Weight Fast
ReadThe Brain Is Growing Fast
ReadAll Five Senses Are Active
ReadBaby Is Gaining Weight Fast!
ReadThe Immune System Gets a Boost
ReadThe Lungs Are Maturing
ReadBaby Is Almost Ready
ReadThe Countdown Begins!
ReadEarly Full Term
ReadBaby Is Ready!
ReadFull Term — Ready for the World
ReadYour Due Date!
Read