She’s a caricature baby person, she squeals and claps and gasps and falls and thinks it’s cute and adorable instead of really unappealing when one is late 30s, let alone late 50s.
It’s one reason the Petrovsky relationship fails, he is an adult and she acts like a teenager. I have an enduring crush on Baryshnikov so I think Petrovsky offered her a lot but she wanted him to be something else. And getting hung up on the baby thing… she didn’t have a baby with Big either. It was her who didn’t want one not the man, and that’s ok.