i posted earlier how Avie loves lil kids and babies too..
i want to think its because they're smaller & closer to their height!! hehe. they arent as TALL as adults are..
i dont know, maybe??
Also-whenever someone talks in a higher pitched, excited/playful voice.. Avery gets so excited.. im sure many of your babies are the same way?? So, maybe they also associate the kids higher pitched voices and babies coos and cries..to the 'excited/playful' voice they love so much!??