There's a limit to how many times you can change your birthday. If you've recently changed it, you may have to wait before you can edit it again.
To add or edit your birthday in Accounts Center:

Instagram app for Android and iPhone:
Tap

or your profile picture in the bottom right to go to your profile.
Tap

in the top right, then tap
Settings and privacy.
Tap See more in Accounts Center, then tap Personal details.
- Tap Birthday, then tap Edit to change your birthday information.
Note: Not everyone will be able to access this setting in Accounts Center at this time.
If the steps above don't work for you, try updating your birthday through
Edit profile from your Instagram profile.

Instagram on your computer
Click
More in the bottom left, then click
Settings
.
Click Accounts Center, then click Personal details.
- Click Birthday, then click Edit to change your birthday information.
Note: Not everyone will be able to access this setting in Accounts Center at this time.
If the steps above don't work for you, try updating your birthday through
Edit profile from your profile.
Birthdays need to match across all accounts in an Accounts Center. If you add a new account that has a different birthday than your other accounts in the same Accounts Center, we may ask you to select your accurate birthday before your new account can be added. When you add your accounts to an Accounts Center, you may be asked to verify your age if you try to access certain experiences and features across Meta, like
Facebook Dating. Learn more about
settings you can manage in Accounts Center.
Note: Once you add your birthday to your profile, it can’t be removed. Also, your birthday won’t be shared with other people on Instagram.