What, lesbianism is a "fad" that only arose in the last couple of years? Or is it that you just don't like the idea that lesbian or gay couples are allowed to raise children?
Nope. Just this strange insistence on breaking the laws of science to make people feel cuddly.
I'm quite happy to accept that some same sex partners may make better parents than some mixed sex partners, but can we please cut out all this two "daddies" and two "mummies" crap, please?
I sincerely hope that the two parents you have referenced are going to be truthful and honest with her as she grows up, otherwise she's going to be mighty pissed off with them when she learns the truth.
ETA:- And another thought. If these two split up will they both have the same rights to the child? No? Didn't think so.