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Development Leaps

A pregnant parent sitting on the bed by a window at dusk, a lamp lit beside themA pregnant parent in a long cardigan at the window, one hand under the bumpA pregnant parent resting in an armchair under a floor lamp, hands on the bumpA parent in an armchair holding a newborn to their shoulder, the crib beside themA baby on their tummy on a linen blanket, reaching for a wooden rattleA parent at the table with a bowl of soft vegetables beside a wooden high chairA baby taking first steps towards a parent kneeling with open armsA toddler stacking wooden blocks on the rug while a parent sits beside them

ExampleYour baby can feel you dance.Week 24

Photograph is AI-generated.
11.8 in
1.3 lb, an ear of corn
Balance
Inner ear complete
Taste
Buds active, likes sweet

Roll over, bend down, sway in the kitchen: your baby notices all of it now.

The inner ear is complete this week, which gives your baby a sense of balance. Your movement rocks them during the day, so many parents feel more kicks when they rest.

From the week 24 guide. Read all of week 24

How the timeline works

Pregnancy runs week by week, from week 4 to week 40. After the birth, the timeline runs month by month until your child turns two. Each stop is a short read from our pregnancy week by week and baby month by month guides, with the tools that help right then.

Questions

What is Development Leaps?

A timeline from week 4 of pregnancy to your child's second birthday. Each week or month has three facts, a short read from our full guide, the tools that help at that point, and a place to save one line to your Memory Book.

How does it know which week I am in?

It reads the due date or the birthday in your account. In pregnancy, weeks are counted from the first day of your last period, 280 days before the due date, and a new week starts at midnight where you are. After the birth, a new month opens on the same day of the month as the birthday.

Do I need an account?

No. Anyone can read every week and month. To open the timeline on your own week and save moments to your Memory Book, sign up and add your due date or your baby's birthday.

What happens after the birth?

Once your baby's birthday is in your account, the timeline moves from weeks to months. It follows your baby month by month until their second birthday.

Where do the facts come from?

From our own pregnancy week by week and baby month by month guides, which are based on guidance from the WHO, ACOG, the AAP and the NHS. Every week and month links to its full guide. Every pregnancy and every baby is different, so ask your midwife, doctor or pediatrician about yours.

Does it show the Wonder Weeks leaps?

Not as a calendar. The timing of the ten mental leaps described by Frans Plooij and Hetty van de Rijt varies from baby to baby, so the timeline follows what our month guides say about each month. Our guide to baby mental leaps explains all ten.

Read more