I just got this event again in a fairly new village (21, now 23 villagers). They are working to get L3 Engineering so everyone is at the research table apart from one nursing mother and a runner who is manfully feeding everyone as an adept farmer. The two who arrived were Malo, 24, a trainee parent, and Amina,who is 29 and a trainee doctor. Before I was able to identify Malo, he announced his arrival by kissing one of the lady villagers! Very forward, considering they hadn't had time to be introduced yet! She might have been a relation, though - she was the woman who first fell down the waterfall, now 63. That meant, of course, we didn't get any more babies "by accident". I'll have to keep a sharp eye on Malo, to see that he doesn't get too friendly with the younger girls.