Based on the info you provided it seems like you need to update your information with the IRS so that you can make sure you successfully get your monthly payments!
Some common reasons you may have to do this include:
Had a new kid in 2021 (remember the IRS doesn’t know that until you tell them!)
New filing status that you will use in 2021 (maybe you got married or divorced in 2021 for example)
Head to the portal now
if your change has already occurred (like you’ve already had your new baby) or later this year when your situation changes.
In that portal you can also update your banking info (in case you want to receive checks by direct deposit or get them mailed to a new address).