We are married filing jointly. Our second child was born in late 2021. Does this second child qualify for the $1,400 stimulus payment? How do we claim that?

We received stimulus payments for ourselves and our older child (let's say, 5 years old).  Since our new baby was born October 2021, will the newborn qualify for the full stimulus (or prorated?).  We do not know if there is a box to check in our 2021 taxes to claim this or if it will pay out automatically and separately once the IRS sees the newborn on our 2021 taxes.