Recovery Rebate credit

I was denied this credit for my daughter who was born in December of 2020. If they show children amd babies were eligible who were born between January 1 2020 through December 31 2020 why would they deny her? Also we are a family of 4 and we only got a deposit of one 1400 payment!? We are all filed on our 2020 taxes so what can we do?