Bangs two things together
What is this milestone?
Bilateral coordination
Your baby deliberately brings two objects together in the midline of their body to make a satisfying banging sound.
Why it matters
Banging objects together requires excellent bilateral coordination—the ability to use both hands simultaneously in a controlled manner. It also shows a developing understanding of cause and effect (action produces noise).
What to expect leading up to it
They usually start by banging one object against a surface, like a toy on a table. Once they realize the joy of noise-making, they will figure out how to smash two items together, often with great enthusiasm.
How to encourage and support it
Provide safe items for banging, like two small wooden blocks, plastic cups, or pot lids. While it can be noisy, celebrate their musical 'performances' and introduce different materials to show how they make different sounds.
When to talk to your doctor
The CDC's milestone checklists say what most children (75% or more) can do by each age. They list “Bangs two things together” by 9 months. If your child is not doing this by then, the CDC's advice is not to wait: talk with your child's doctor, share your concerns, and ask about developmental screening. The same goes at any age if your child loses a skill they once had, or if anything else about their development worries you. Source: the CDC's “Learn the Signs. Act Early.” milestone checklists, checked October 5, 2026.
Every child develops at their own pace, and the ages here are the CDC's general guidance — not a developmental screening. This article is not medical advice and is not a substitute for your pediatrician. If you have any concern about your child's development, talk to them.
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