If you look at news stories about MTFs and when they realized they were trans, a disturbing number of "lesbian" ones decide they're a woman on the inside during a family member (spouse, sister, cousin, sister-in-law)'s pregnancy. Basically, a woman is getting more attention than me? I'M A WOMAN TOO RESPECT MY NEW PRONOUNS AND TAKE ME SHOPPING SHITLORD. A lot of them don't talk about it, but it's in their stories if you look: "told his wife about the fact that he's always been a woman just over 8 years ago," followed by "The couple's 8 year old daughter." It's almost as transparent as the ones who troon out because their wife has cancer and they're desperate for any way to shift attention and asspats back to them.
The part they want isn't about the birth or the child, it's about the way they imagine women are treated and feel during pregnancy. They get this imagining from movies and TV (usually written by men), not from actual women they know. This is why when they talk about how they resent women for having girlhoods, they talk about all the experiences they never had, and it sounds like they just watched 80's movies to decide what being a true and honest girl was really like: slumber parties, pillow fights, being prom/homecoming queen, ponies, princess dresses, playing with dolls.
So by this standard, pregnant women have it easy! Everyone is nice to them, the plot always revolves around them and their needs, birth is a comical "why'd you do this to me, you bastard," and everyone's always happy at the end, you look the same as you did before, and no one is getting mesh surgically implanted to avoid fecal incontinence and then having the mesh destroy their vagina permanently. Pregnancy and birth is a piece of cake if you've gotten your information from TV and movies.