Ways to find playmates for our future kids?

Hi there! Just wondering if anyone knows a good way to find kids that our future kids can play with. It could be like a support group when they are younger and may even be friends growing up which sounds so nice. Only problem is I don't know how to find them. Is that something I can do on this app, or where would it be posted? I am 5 weeks due the 28th of February.