Your 9-Month-Old: Clapping, Waving, and Finding What Is Hidden
By the Growbaby team · Published Aug 4, 2026
Written against AAP, CDC and WHO guidance. How we write these guides
At a glance
- Clapping and waving are social gestures, learned by copying and repeated for the response.
- The pincer grasp, thumb against finger, changes what your baby can pick up.
- Looking for a hidden object means object permanence has arrived.
- Smaller objects on the floor now matter much more than they did last month.
- Gestures often come before words and count as communication.
Object permanence is the quiet headline of month nine. Hide a toy under a cloth and your baby lifts the cloth, because they now hold the idea of the toy in mind while it is out of sight. That same ability is why leaving the room got harder: you continue to exist while absent, and that is worth protesting about.
The pincer grasp arrives around the same time and is the other reason this month changes housekeeping. Anything small enough to pick up is now genuinely reachable.
What is new this month
Object permanence is the quiet headline. Hide a toy under a cloth and your baby lifts the cloth, because the toy now exists in mind while out of sight. That same new ability is why leaving the room got harder: you continue to exist when absent, and that is worth protesting about.
Clapping and waving are learned by copying and then repeated for the response they get, which makes them social before they are physical. The pincer grasp arrives around the same time and is the other reason the month changes housekeeping: anything small enough to pick up is now genuinely reachable.
Week by week, in the app
Our paediatric specialist wrote one thing to notice and one thing to try for every week of the first three years. Here is what this month covers. The app works out which week your child is in from their birth date and brings each one to you on the day.
- Week 36Your baby is Clapping
- Week 37Your baby is Waving Bye-Bye
- Week 38Your baby is Using the Pincer Grasp
- Week 39Your baby is Looking for Hidden Objects
This week, for your baby
Growbaby works out which week your baby is in from their birth date and brings that week's activity to you on the day, so you are not looking up where you are. Plus adaptive soothing for the nights and Growy for the questions in between.
This guide is for general informational purposes only. Growbaby is not a medical device and does not provide medical advice, diagnosis or treatment. Every baby develops at their own pace; for any question or concern about your baby's health or development, always consult your pediatrician or another qualified healthcare provider.