I had a child born in August 2020. When I filed through TT online the system didn't file my child as eligible for child tax credit. How can I fix this and amend with TT?

Item 6 in "Top 7 Requirements for the 2021 Child Tax Credit:" explains how my child should qualify for full child tax credit.

https://turbotax.intuit.com/tax-tips/family/7-requirements-for-the-child-tax-credit/L3wpfbpwQ