Did you already file? Yes you can amend to add your baby. You need to wait for it to be fully processed and you get the first refund. Then you can Amend.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-curr...
When you add them under My Info. You need to answer 2 questions…..
Did your child live with you for the whole year? Answer YES even if they were born late in the year even on Dec 31. And same for how many months in the USA
Then was at least half of child's expenses paid by CHILD? Usually is NO, Child didn't pay for more than half of their living expenses.
