Drinking another Mom's milk: is it safe for baby?
It can be, or it can not be. If your baby is going to drink another mom's milk, I would suggest taking a good, detailed look at that mom. It needs to be someone you trust and know that they aren't doing any drugs (illegal or prescription) and that she doesn't have any communicable diseases. Most of what we put into our body transfers to breastmilk, so you'll want to be sure you know without a doubt that the mom giving you milk hasn't been putting harmful or dangerous things into her own body.
There are milk banks available where they do most of the screening for you. I believe there are also strips that you can buy to test breastmilk for alcohol, drugs, or other potentially harmful substances.
Sharing milk can be safe, but you need to be sure it is done properly and safely with a trusted source.