After you file

Thank You, one other question.  I never got my stimulus checks, nor for my daughter who’s 1 years old.  On my tax return I was suppose to get the first 500, and 600 for the second.  How do I get the 1400 for third as that was not added to the program yet when I filed? Thanks for your help!! Should I wait and amend ? Or is there another way to receive it??