Wee Sale Greenbelt then Outback

After work I met my mom at the Wee Sale in Greenbelt, traffic kinda sucked getting there. It was practically empty too. I ended up getting a few things: 3 winter outfits for Jemma, one dress for Kenzie and 2 toys. It came to $40 which I thought was a little high, but cheaper than getting them new. Jemma was a little fussy there and we let her run around for a little while. Afterwards, we met Mike and my dad at Outback for dinner. The food was good but Jemma would not for the life of her sit still in the high chair. We were in a booth and she was between Mike and me and we spent the entire dinner feeding her, taking stuff away from her, or occupying her. I wonder at what age they start to sit still in a high chair and eat nicely ... ??