I have two daughters. Neither wants to have children. They're adamant about it. My husband is upset, but I'm ok with it. Their bodies, their lives.
If Lydia doesn't want to have a baby for vanity reasons, or from a real sense of knowing she won't enjoy it, or is simply terrified of the prospect of the responsibility of it all, she should not have any. My only problem with it all is that Ali has always wanted kids, according to him, so this should have been discussed and agreed upon before they got married. She is being coy not only with her audience, but with him as well, at least on film. Her whole "MAYBE 1 baby" is, I feel, a way to keep him on the hook. If she does give in and have a baby only for Ali, she will be even more insufferable towards him. And the child will suffer horribly.
No one should give up being a parent for their partner. And no one should have a baby only to please their partner. It's the one thing that I strongly feel shouldn't be a "compromise" in a relationship.
Having said all that, it would be ironic if she does it and ends up a single mum, like her own mother. Perhaps then finally she would have some empathy for what her mother went through raising 2 children alone after being dumped for a younger woman.