Was pregnant and gave birth but my child passed the same day. Do I still claim my child? I have birth and death certificate, and also social security

[DoninGA]

Yes, you can claim the child as your dependent on your 2019 tax return as you do have all the required documentation and their SS number.  When entering them as a dependent make sure that you indicate that they passed away in 2019 and the date of their passing.

[DoninGA]

Additionally, when entering the child's information you will be asked how long the child lived with you.  You should select the whole year since a child born during the year is considered living with you for the entire year.  Even if the child was born and died during the same year.