Legal Question in Family Law in California

Can't be done, if the child was conceived "spontaneously," which is the doctors' term for the old fashioned way. Coincidentally my girlfriend and I faced just this issue. She wanted a baby when we met. Had a sperm bank and fertility doctor lined up, pretty much ready to go. We really hit it off and so we decided to use me, but the relationship was so new she didn't want to give up the right to be the sole parent if things went south. We agreed that I would sign away paternity and we consulted a specialist attorney who only handles adoptions, fertility law, and related matters. She confirmed that I could do that. It would be the same as if, say, an infertile couple wanted to use a member of the father's family for sperm instead of a stranger. There are laws and forms for "known donor" paternity waivers.

So we went through IUI, and then IVF. No baby. So facing the prospect of needing a donor egg, etc., etc., etc., we decided to take a break and think things over. As you probably have guessed we got "spontaneously" pregnant the next month! So we go back to the specialist attorney for me to give up paternity. She told us "no can do." If you do it the "fun" way, you get to be parents together for as long as the three of you are alive.