K.N.
My son went from high chair to bar stool.(At about 20 months) Our kitchen table is a bit elevated. My daughter is 19 months and I just bought a boster chair for her. She is really tiny and I wasn't comfortable putting her in the bar stool. And she wasn't having the high chair thing any more, she would wiggle her way out. She seems very content in the booster chair. I would wait a bit if the high chair is working and maybe skip the booster all together if possible,
K.