Filing a family case due to domestic violence

Dear sir/madam,

My husband always beats me every time he gets angry.

I have lots of proof on my phone. I can't file a case against him because my 7-month-old baby is with him. He took my baby away from me when my baby was 4 months.

What is the best way to get my baby back?

Do I need to go for medical to have legal proof?

What is the case I can file against him?