What to do if your expecting baby how can i add new baby as a dependant

[retiree]

You cannot claim a new baby as a dependent until after the baby is born.  If the birth is on December 31 or earlier you can claim the baby for the entire year. 

[xmasbaby0]

You cannot add your child as a dependent unless the child was born in 2019.  

Next year, when your child has actually been born and you have a Social Security number for your child, you can claim your child on your 2020 tax return.