Play date etiquette

So, I met this man who has a son who’s a few months younger than my own. We’ve been talking for about a month and I brought up the idea of a play date - all friendly nothing else.

I informed my partner of the play date and he’s down with it. This guy didn’t inform his child’s mother at all. While I don’t know the exact dynamics of their relationship, all I know is that I don’t feel necessarily comfortable meeting with a young child without knowing the mother is okay with it.

His response was: Nah it's not even like that. It's just with certain things ya gotta know how to move that's all. Some ppl won't say yes to a plan but if the plan is already in motion they go along with it

I just feel like he’s trying to formulate a one-sided plan here.

He tells me they are on good terms and do-parent very well. I’m not sure why he doesn’t want to let her know.

I just don’t want some chick trying to come at me side ways because he wants to be awkward about this. What do I do? Should I just move forward with this or call it off?

And yes. My partner and I have play dates with the opposite sex all the time. its our normal.

**update**

They aren’t together. I’ve just been put in situations before where either the father or mother has gone off on me for being around their child without notice. I just don’t feel like going through it again. Plus, I just feel it’s a respect thing.