You can claim a child born in 2022 on a 2022 tax return even if the child is born one minute before midnight on December 31. Newborns can be claimed as having lived with you the WHOLE YEAR even if they were born at the very end of the tax year. Make sure when you enter your child in My Info on your 2022 return you choose that the child lived with you the whole year.
As for filing as head of household---if you are the child's bio-dad, then you can file as HOH and claim your child and get the child-related credits. If your GF lived with you the whole year and had less than $4400 of income (not counting Social Security) then you may also be able to claim her as a dependent.
Am I Head of Household?
https://ttlc.intuit.com/questions/1894553-do-i-qualify-for-head-of-household
https://ttlc.intuit.com/questions/2900097-what-is-a-qualifying-person-for-head-of-household
If you qualify as Head of Household, when you enter your marital status (single or married filing separately) into MyInfo, and then enter your qualifying dependent, TurboTax will offer HOH as your filing status.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
