Since you are still married your filing choices are to file married filing jointly or married filing separately. You cannot fill as Head of Household because you did not live apart for at least six months--you were apart for only a month of 2024. If you file MFS, you and your spouse will need to agree on which one of you claims the child---and use the tiebreaker rules if you cannot agree.
TIE BREAKER RULES
https://itap1.for.irs.gov/owda/0/resource/Commentary_Files_Redirect_ITA/en-US/help/tbrk09.html
**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.**
