Have you had children in polyamorous setting?

So my partner whom I consider main right now doesn’t want children. We have been together for almost a year. I am fifty/fifty, total fencesitter but I can imagine future in which I may want to have a baby. The other person I’m dating doesn’t want children either. I am thinking about talking to my partner and ask him how he sees our future. I want to tell him that I think I will start dating more people in order to find a partner with better alignment. Or somebody that already has a child. It’s not that I want to scare him but being in a relationship and making it main without any options if our baby misalignment really messes things up, makes me feel unsafe. I keep thinking about it even tho we promised that we won’t talk about it for now. Sometimes I feel that I’m really goin insane. I want to invest in this relationship, we are thinkig about living together. I feel that my partner should be aware of my thoughts. He hates „whataboutism” and talking about imaginary situations and I get it. Also I don’t want to force him into anything. If he changes his mind on this baby issue - great. If he doesn’t - then I want to have a clear situation.

What do you think? Has somebody had a similar situation and it worked? In monogamous subreddits I would only get advice „break up with him” but I believe that poly people are more open to different set ups so maybe I will find something here…