Recovery Rebate Credit For 2020 Babies - Not on Return

My wife and I had twins in March of 2020 which we did not receive stimulus payments for.  We claimed them as dependents on our 2020 taxes, e-filed via turbotax and the credit did not show up on line 30 in the 1040.  I can not find instructions on how to amend the return so we can collect the stimulus for our two babies.