I am also having this issue. I can't say for sure when it started because I have infants set to age up after one day with mccc but its definitely been after the last major patch. Its affecting all parents as far as I can tell. If the infant smiles at the parent, the issue resolves itself. Of course I can use a nanny or Butler to make the introduction as well. Im editing my post after a few days because after paying attention and checking in on more families in my game who have infants I have found only a few that havent been affected by this bug. So its not all families in my game but most. I have also noticed that the affected families dont have relationships with their older children even. For example I checked on a household with no infants but three children and a teenager and neither parent knew any of the children or the teenager and had to make introductions to all of them. I dont want to have to start a new game because this is a legacy save. So if there are any updates on this issue Id love to hear them. *No beloved trait or grimborn (almost forgot that)
