Our son has been eating solids for a few weeks now and we are wondering how much to give him each time. We have been giving him a tablespoon or so but he always gets upset when he's all done and we take the empty bowl away. We're afraid to give him too much as it might cause a tummy ache, or so we think. Are we wrong in this or should we let him keep eating until HE stops? He appears to be insatiable.