How do I get my son’s stimulus? I had a baby during pandemic. I already filed my 2020 return (on 2/4/2021) but not received it. Didnt get it with mine, not on tax return.

We got the first and second stimulus for him on the 2020 tax return but didn’t get the third on the return, nor did it come with mine. Taxes filed 6 weeks ago, no return received yet.