( Another one from @neonthesprite )
If we’re just talking about baby wood sprites (which are endearingly called sprouts), they nurse from their mothers or maybe a wet nurse, if needed. When they are a little more developed, they can have soft fruits if they’re mashed/chewed a bit for them first, much like a human infant. The important part is making sure they eat enough. Their little wings remain curled up in their little leaf bud shapes while they’re young, so they don’t get very much from the sun. Wood sprite mamas fuss about their babies getting enough energy most of the time.
Writerly Things 