itty
Playfully very small
Itty is informal for very small or tiny, almost always paired with bitty: an itty-bitty kitten, just an itty-bitty piece of cake.
The reduplication emphasizes smallness with childlike or affectionate overtones.
Itty alone is rare but occasionally appears: that itty thing.
Very small, informally
mini · pint-sized · teensy · itsy · diminutive · pocket-sized · compact · miniature
teeny
Very small, informally
small · mini · pint-sized · teensy · itsy · diminutive · pocket-sized · compact · miniature · peewee