Select your pregnancy week from the timeline
Select your baby's age in months from the timeline
Select your toddler's age in months from the timeline
How your body and your developing baby change trimester by trimester
The first trimester – weeks 0 to 13 – will probably be the most life-changing your life. You're going to be a mum!
The second trimester covers weeks 14 to 26. You'll see lots of changes in you and your baby
The third trimester of your pregnancy covers weeks 27 to 40. Be patient, the wait is nearly over!