I didn’t want children, my husband did. I eventually came round to the idea and we have one now. When the baby is sick or has a pooey nappy, I’m not going to leave it because I didn’t want children once.
Children are not comparable to animals and I wouldn't personally want a child with someone who came round to the idea and it wasn't what they wanted themselves from the beginning.
It's far too big a commitment to just have a come round to the idea of IMO.
If I met a man who didn't want children and I did, I wouldn't see him as being compatible for the long term.
It may work out fine in the end for people, but there's no way I would start talking a man round to having a baby, when his first feeling is he didn't want them.
I once wanted to go to a certain location for holidays, DH wasn't so keen...but after me showing him all the activities we could do there which he liked, he came round to the idea.
If he didn't like it when we got there, it's just a holiday and we come home in 2 weeks to our normal life. It's not a lifetime commitment like having a child.
To be honest I'm amazed (on other threads) the posts I see where one party has been talked round, or agreed to have a child for their spouse/partner.
I believe a child should be wanted by both parties, without talking round, pressuring or ultimatums. I can see how resentment could creep in down the line if/when difficulties arise.