I have two children and they are listed as my dependents on the main 1040 page as well as under the Child tax credit form. However, Turbo tax only included one child under the Earned Income Credit form. Is there a reason Turbo Tax would not carry all my children's information for every form for which they were important and necessary. I caught this a week after filing and it could amount to a difference of almost 2,000 dollars.
From reading your other posts, it seems the error may be in how you entered your child born in 2020. When entering a child born during the tax year, you must select they lived with you the entire year. If you did not do this, it could eliminate them from the credit.
You'll need to amend your return and mark the child as living with you the entire year.
See this TurboTax FAQ for help with amending.
You can check the status of your amended return here, but allow 3 weeks after filing for it to show up.