I answered a question by mistake so that I didn't get the Child Tax Credit for my newborn baby. How can I do?

Dear there,

 

I filed my tax yesterday on TurboTax, but I found I made a mistake so that I missed the claim for Child Tax Credit for my newborn baby. 

 

My baby was born in late December 2020. I didn't select "The whole year" lived with me. I selected "0 months" by mistake. So, I missed the claim! But, I have filed the tax. How can I do to make up for my mistake?

 

Thank you!