I had a baby April 2019-had filed taxes already-only received stims 4 myself last year..on taxes I get the child care credit but nothing about dependent stimulus missed

I had a baby in april but had already filed 2018 taxes..I'm the only parent claiming my son. Last year I only received 1200 for the first check then 600 for the second. When I filed this year I received the child care credit but when I get to the stimulus part and put in my 600 and 1200 it's says that's all I should have received. There's no part to put any missed funds to claim for my son..again he was born in 2019 he should have been eligible...It's only when I reduce these amounts to 0 and 600 does it reflect any change to how much I'm getting back. Does anyone know how to fix this or should I just submit with the altered numbers and hope it just processes?