our chair is the FP portable highchair (clips onto dining chair) which goes from reclining chair to booster seat. Only yesterday did I take the back off to make it a booster because he refuses to sit in the 'highchair' anymore. He'll be 2 at the end of Feb.
DD was younger I think but she's incredibly tall and could sit at the table much earlier. Just can't be too fussy on how they sit until they're bigger.