Sorry to say, but probably not a phase...
We switched DD2 into a booster at the table right around that time because she kept climbing up into the chairs and pitching a fit if we tried to move her to the high chair (which was already pushed up to the table - so she was not off in a corner eating by herself). DD1 was even a little younger - when we took her to Disney on an extended family trip at 20 months she had already been out of the high chair for a couple of months. I know there are babies who are still happy to sit in a high chair at 2+, but mine were definitely not!
Even more fun: at 26 months, DD2 has decided that restaurant high chairs and boosters are not necessary. And really, we can't argue that point because nobody wants to be in a restaurant with a 2 year old having a tantrum over seating arrangements, so we sit in a booth and constantly correct her about standing up, trying to climb onto the table, sliding down under the table, etc. We don't eat out so much lately.
Sarah
Mommy to:
Carolyn, 10/04
Anna, 7/08
Matthew, 8/13