Baby Developing inside you

Fetal Development


Baby developing inside you
over the weeks and months
 baby inside

 

Weeks, Months and Trimesters Guides

 
Your Weekly Guide  Your Monthly Guide Your Trimester Guide
 
 
 
 
 
 

  

Week One:

  
This is the week of your last menstrual period. The first day of menstrual bleeding is considered the official start date of pregnancy and the 40 weeks of pregnancy are calculated by this date.

Not sure which week?   Use the Weeks - Due Date Calculator and see how baby develops.

Pregnancy is broken down into weeks, and full term pregnancy is considered 40 weeks and an infant delivered before the 37th week completed is considered premature. Pregnancy is counted from the first day of a your last menstrual period. This means that at conception, around the second week, you are already considered two weeks pregnant.
The first, second, and third months are the first trimester of pregnancy.

 |  Month 1  |  Week 2 >>>


  

Week By Week Pregnancy Calendar

 
First Trimester
Week 1   Week 2   Week 3   Week 4   Week 5   Week 6   Week 7  
Week 8   Week 9   Week 10   Week 11   Week 12   Week 13
Second Trimester
Week 14   Week 15   Week 16   Week 17   Week 18   Week 19   Week 20  
Week 21   Week 22   Week 23   Week 24   Week 25   Week 26
Third Trimester
Week 27   Week 28   Week 29   Week 30   Week 31   Week 32   Week 33  
Week 34   Week 35   Week 36   Week 37   Week 38   Week 39   Week 40