Leaving your baby with maid at home

I will be home for the first 3 months after birth, then I'll have to go back to work. So I'm wondering how old should your baby be that u can leave your baby with the maid alone at home? I'm worried if something happens my maid cannot handle it alone of if she wasn't paying attention. My mother in law is retired and I can ask her to help me look after our baby. Let me know what you guys did! Thanks in advance!