Should I amend my filing? I filed my taxes in February reflecting my new dependant from 2020. The third stimulus still reflects 2019 tax info. Help! I'm missing money!

You can read everywhere (including TurboTax) that an early filing would be wise to get the correct amount from the third stimulus.  Well, I'm missing the amount for my newest child from 2020. My tax filing was "accepted" so what should I do? I'd like to use/invest that money for a year and not "wait til next time" ugh.