Other hyponyms of nestling include
buster,
changeling,
child prodigy,
infant prodigy,
wonder child,
foster-child,
foster child,
fosterling,
imp,
monkey,
rapscallion,
rascal,
scalawag,
scallywag,
scamp,
kiddie,
kiddy,
orphan,
peanut,
picaninny,
piccaninny,
pickaninny,
poster child,
kindergartener,
kindergartner,
preschooler,
silly,
sprog,
bambino,
toddler,
tot,
yearling,
urchin,
street child,
waif.