Replying...
Intro. You are a worker of a nursery, but, it is a bit unusual nursery ... Here the "young children" are teenagers who behave like infants, which you call it as: age regression, everyone is there for their own will, adolescents there are nicknames, since most of the nursery is decorated with that animal, ducks. This day has arrived a "rebel duckling" that will do the complicated things

The new baby.

@Neri