Ok ... so a child that was claimed by you last year so you got the stimulus on that child. And the other parent is claiming that same child on the 2020 return so they will get the credit as well. Thus that child is being claimed TWICE.
Now you have a new child on the 2020 return but you already got the stimulus earlier on the first child so you do NOT get it again on the new child. This is backside of the double dip situation on the first child because the ADVANCE payments were based on the 2020 tax return. Sorry but you don't get more ... the program is correct and there is no way around it.
