Trouble adding Children to adult guests on hitched

It's a bit of a long way round but once you have created the guest go into the guest details. Then Add Companion. Write their first name and then the Add button will appear and once you click that button it will let you select Child. Hope that helps

I have been seeing a similar issue! I was adding people as companions. (E.g: I added my Uncle as the main contact, then added his wife as a companion and then their child as another companion).
I changed my cousin to ‘child’ and then hit save. However, when I went back into the contact, the wife was now showing as child and the child was still showing as an adult. So I either had to leave them all as adult, or the first companion (who is actually an adult) had to be the one labelled as a child. A bit of a pain, but doesn’t majorly matter I suppose.

This is happening to me too!! So frustrating!!!! How does it work if you have different menus for kids and adults?