Thanks Chris. Your answers are always appreciated. I still wasn’t quite satisfied with your translation in this context though, but I found another possible meaning for “et encore” at the end of a sentence which makes more sense to me i.e. “if that”.  For example “ça vaut dix euros, et encore”. That’s worth 10 euros, if that. Or in the case of this exercise, the baby might only wear the clothes once, if that.

Et encore -- and even then, and still

This is an idiomatic phrase.