My roommate has a child with a woman who just ditched her child with me despite me saying no. Can I call the police and turn the baby over?

I don't know if they'll just take the baby, or who I can call that will.

My roommate is at work and can't have his phone on him even for 6 more hours. I don't have the mother's phone number and only know her first name.

I don't know what to do at all.
Update: She's only months old. I don't know how many. She can't talk or walk.
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