No Stimulus for dependent

Hello, I am struggling with finding the answer to my question. I had my baby in 2019 and did not get a stimulus for him the first 2 rounds. Turbo Tax says I got all the money I should for myself but it says nothing of what I should have gotten for my son. I am missing the 1,100. Please tell me how to fix this. I spoke to a turbo tax rep a couple of months ago and she gave me an IRS number that isn't working.