High chair stander

Cavegeko

Hi, DD won't sit in her high chair now. She will stand there grinning and won't sit when we ask/tell her too. She can push her chair away from the table and climb into it and stand there. She cries when we sit her down. She cries really really hard when we use the straps. She will stand/ kneel in the regular chairs to eat. She will sit on our laps to eat, but we only started that as a last resort since we really really want her to eat. She needs to gain weight and eat more calories than she burns off running around. She weighs less than 17 pounds. The last thing I want is for her to loose her balance when she stands. We want her to sit and eat with us when we eat. This standing thing is new as of middle of last week. She doesn't stand in her chairs at DC, so I don't know where this is coming from. Would it be time to switch to a booster seat or something else? We have the oxo sprout high chair. We tried lowering the seat so that it wouldn't be as easy for her to push away from the table with her feet. Now she just uses her hands to push away and then stands and grins. This is really driving me up the wall and making me really worried. I am looking for suggestions, please! TIA!!! (I also posted this in June 2012 moms...)