Wow, girly, what a horrible comment for someone to make - and on Christmas to boot. I can't imagine what goes through the head of a person like that. Do they have no clue how hurtful a statement like that is or do they just want to be cruel? I was married to a woman who had fertility issues and I never considered her any less a woman for it. It's just a quirk of biology - I was born with a birth defect in one of my eyes - does that mean I'm somehow less of a man? Or if instead I had been born with sperm issues, would that have also meant I wasn't a full male?
I wish I had been there when that cousin said that to you - I've very good with my words in the moment - I would have let a real zinger out at her (I'm assuming it was a woman who said it - it sounds more like a woman/catty sort of comment than a male/asshole one).
I know what you mean about babies, though. I was out on the ferry dock today and a couple with a baby girl was getting off the boat that I had to get on - I offered to help and the mum passed up the baby. Just holding her for the 60 seconds that the mum needed to climb up the ladder felt so nice. I've been waiting for this so long, I think it's going to take months before the thrill of being able to hold my own child wears off. Not that it will ever go away, but at first it's going to feel like a miracle each time.
Anyway, sorry that someone said something so hateful to you today of all days. The fact that you had the self-control not to slap the s**t out of her shows you are more of a woman than she'll ever be. And if she ever says it again just say "Well you, my dear, are certainly no lady!"