Mental leaps are periods when a baby is thought to make a fast jump in mental development. According to this approach, there are 10 leaps in the first 20 months. During a leap, your baby may be fussier, clingier and cry more. Sleep and feeding may be off for a while. After the leap, new skills appear, such as turning toward sounds, noticing patterns and understanding how objects relate to each other.
The leap calendar is calculated from the due date, not the birth date. A baby born early may go through leaps later than their actual age suggests. These dates are only estimates and every baby is different. Some babies go through leaps very visibly, while in others you barely notice them. This approach is not a scientifically proven timeline, but a framework that gives parents some guidance.
Knowing about a leap reminds you that your baby's fussiness may be temporary. During this time, closeness, skin-to-skin contact, a calm environment and small breaks for yourself help. Fussiness isn't always caused by a leap. If there are symptoms such as fever, vomiting or refusing feeds, talk to your doctor instead of putting it down to a leap. If you get tired along with your baby, that's normal too.
What you can do
- See which leap your baby may be in on the active leap card.
- Shows how many weeks until the next leap starts.
- Start, peak and end week for each of the 10 leaps.
- Fussy signs, new skills and parent tips for each leap.
- For premature babies, the calculation uses the due date.
- Get an AI insight based on your baby's current phase.
How to use it
- Make sure your baby's birth date is saved in your profile.
- See your baby's current phase on the active leap card.
- Read the leap's signs and tips.
- Browse upcoming phases in the list of all 10 leaps.
Frequently asked questions
What is a mental leap in babies?
A leap is a period when a baby is thought to make a fast jump in mental development. During this time your baby may be fussier, clingier and cry more, and sleep and feeding may change for a while. After the leap, new skills appear. According to this approach there are 10 leaps in the first 20 months, but the timing differs for every baby.
How long does a baby leap last?
The length of leaps varies. The first leaps may last a few days to about a week, while later ones can stretch over several weeks. Fussiness is usually most noticeable at the peak of the leap and then settles. Every baby experiences it differently. If the fussiness lasts for weeks or comes with other symptoms, talk to your doctor.
What are the signs of a baby going through a leap?
During a leap, babies are often fussier, don't want to be put down, cry more and are harder to settle. Sleep may be disrupted and they may wake more often. Some babies want to feed more, while others lose their appetite. These signs are temporary. Closeness, skin-to-skin contact and a calm routine make this time easier for both of you.
How are leaps calculated for premature babies?
The leap calendar is calculated from the due date, not the birth date. That's why a baby born early goes through leaps later than their actual age suggests. For example, in a baby born 4 weeks early, each leap is expected about 4 weeks later. These dates are still estimates, and your baby's own pace is what counts.