Claiming Newborn on Taxes!

I think my caseworker needs some evidence that claiming a newborn is okay to do. I have heard of it before but when I sent my fw an email letting her know and asking if I needed to let the visit supervisor know so she could tell bio mom she said she would do some checking and get back to me. I have a call into my tax person but even she sounded a bit unsure. Anyone know where I can find something to support my claim that it is acceptable to do this?