I'd have to agree with that generalization. It is especially bad when dealing with older generations of women... who often had no choice about what kind of life they wanted. No one asked my grandmother if she wanted 6 kids.
The reproductive lives of women have been heavily affected by sexism from all directions. And sometimes when people don't feel they were given a fair shot, they don't want anyone else to have it either. It makes sense to me that this attitude mostly comes from women for that reason. This can go off into really extreme directions. I have a friend whose mother says she will disown her and write her out of her will if she doesn't have a biological child. I know a woman whose ex-boyfriend beat her when she refused to agree to have his child. It's true a lot of things can bring out the crazy in crazy people, but that this is something that would bring up some peoples' heckles so extremely underlines how much more restrictive the box of female expectation STILL is to this day.
On the flip side of that, people are nonchalant about men not wanting kids because there's an underlying assumption that men don't really care about their kids. Equally sexist and incorrect, but at least people don't tend to bug men about it no matter what they decide.