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.
What the CDC checklist says at 9 months
Nine months is a CDC checklist age, and it is a long list compared with six. These are things most children, meaning 75% or more, can do by now.
- Social: is shy, clingy or fearful around strangers; shows several facial expressions; looks when you call their name; reacts when you leave; smiles or laughs at peek-a-boo
- Communication: makes a lot of different sounds like mamamama and bababababa, lifts arms up to be picked up
- Thinking: looks for objects when they are dropped out of sight, bangs two things together
- Movement: gets to a sitting position by themselves, moves things from one hand to the other, uses fingers to rake food towards themselves, sits without support
The two on this list that people misplace
Sitting without support sits here, at nine months, not at six. So does getting into a sitting position without help, and of the two that second one carries more information: holding a pose you were put in is one skill, and arriving in it by rolling, pushing up and catching the balance is another. Our guide to sitting up covers the difference.
Crawling is not on this list. It is the milestone parents ask about most at this age and the CDC does not track it at all, which our crawling guide explains and which is worth reading if your baby is not crawling this month.
The shyness is a milestone too, which surprises people: being clingy or fearful around strangers sits on this list as an achievement rather than a problem. Our guide to separation anxiety covers why, and why it peaks more than once.
When to raise something
The nine-month checkup is one of the visits with a formal developmental screening, so it is the natural place for this. Worth mentioning: not sitting with support at all, not making a variety of sounds, not looking when you say their name, not moving things between hands, or one side of the body doing consistently less than the other.
A skill that has gone away is the one item worth a call rather than a note for the visit.
Week by week, in the app
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
Read next
- When Do Babies Roll Over?Tummy to back usually comes first, at around five to six months.
- When Do Babies Start Crawling?Most babies start moving across the floor somewhere between 6 and 10 months.
- When Can Babies Start Solid Foods?The AAP recommends only breast milk for approximately 6 months, then foods alongside continued breastfeeding.
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.
Frequently asked questions
Around nine months for many babies. Both are social gestures rather than physical skills: they are learned by copying and repeated because of the response they get, which is why they appear faster when they are answered.
Thumb against finger, rather than the whole hand raking something in. It changes what your baby can pick up, which is why small objects on the floor matter far more this month than they did last month.
It means object permanence has arrived: your baby now knows a thing continues to exist when it is out of sight. It is also why peekaboo suddenly becomes so much funnier.
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.