This is a tough one to handle as a parent, because her concern is being generated not by your comments/behavior, but by those of her peers. Thus, the stimulus or precipitant for her concern is not within either her or your control. It sounds like you are adopting a prudent approach via the guidance you are offering her. Be sure not to press the matter too much, and react with equanimity when she raises the matter - i.e., stay calm, patient. Don't let yourself become alarmed. Children who are at either end of the height/weight spectrum can develop negative self-perceptions due to the remarks they encounter. In addition, if children are at the higher ends of the ht/wt spectrum, people often regard them as older than they are. If children are at the lower end of the ht/wt spectrum, people often react to them as if they are younger than they are. This is a phenomenon we should be sensitive to, particularly as children might react to what they are experiencing from others. As long as your daughter is eating sensibll, in a healthy manner, and as long as she is getting sufficient physical exercise, you're doing all you can from that perspective. Watch her to be sure she's not engaging in unhealthy habits, such as unduly restricting her food intake. If she is experiencing a normal range of friendships and activities for her age, her positive interactions with peers will outweigh the other reactions.
I would be worried too. Maybe if you explained to her that muscle is heavier than fat and as long as she's healthy and active it would help. It seems that more and more very young children are worried about their weight. I wish her and you luck.
i would just keep telling her that she is beautiful. nothing can change the way someone thinks no matter the age. She has seen it somewhere , TV, magazines, adults. Could be as simple as looking in the mirror and saying "arrg i look fat today" that is just an example. I know that i go into so many different cloths until i fit into the right one. i know that she watches me and she doesnt know why I do it, but now she changes all the time too. and she is only three. I have taught her that already. I do however never weight myself infront of her ever. I think that best thing to do is be an example.
try to feed her healthy food and play with her and it's good for her to be in soccor tell her your not fat shes soppose to be eating fat at her age when she gets older maybe you and your dauther can jog aroud the park. :)