Birth Certificates

No no no. Don't!! Do you really wanna be responsible for the kid if you guys aren't friends anymore in like 10 years? No way! Don't (and I don't think it's possible anyhow...but still)

Please talk to a lawyer and learn what you are getting into. A birth certificate means you are legally responsible for the child. That includes child support, insurance and medical bills. The government will make you pay should you and her split up. Plus I would assume you would need the true father's permission. He will need to sign his rights over for you to legally claim to be a parent to the child.

My first bit of advice is to contact a lawyer and find out what the laws in NY are.
My second bit of advice is not to do it.
I'm not against same sex families, but there are legalities to consider.
You are not a biological parent, but the same is true for families who adopt.
I'm not sure you can put just anyone on a birth certificate.
If you want to take full responsibility for this child as a true and legal parent, there are ways to have it written up.
Seek legal advice and consider closely beforehand.
No offense, but it doesn't sound to me like you've done your research or had this all figured out ahead of time. I wouldn't do anything impulsive as far as legality.
You can still be there for the child as a parent if that's what you want to do.
Legality has nothing to do with that.

Seek legal advice.
Best wishes.

I could say many things, but I won't. I wouldn't advise it.

If it's just a friend. NO. If it's a girlfriend. . .maybe. I agree with all the others and suggest to ask a lawyer. I know at a local college here there is a prelaw that does free advice type stuff on Wed nights if getting a lawyer isn't possible.

As for if you can in NY, check your state web page for legal info. But you should no that if you list as a parent on a birth cert you are responsible for that child, and could possibly have to pay child support if you split. Are you in a committed relationship with this woman, are you planning on being a forever parent to this child? If not, than I would not put your name on the cert.

No. Don't do that.
You are not related to her in any way and are not a birth parent.
Watch out for liability... YEARS down the road. Don't look at it just for now... think YEARS down the road and how that will impact you.
I would not.

Think logically and rationally... not emotionally or sentimentally.

I am not advocating that you actually do this, but I do believe that the laws of New York do allow it starting in 2008.