Stunted growth in a 26 months old toddler

Hello,
I dont understand what happened but I cannot find any traces of my initial post, thats really a pity!
I had good advices on this forum, especially by Dr anuj srivastava and I wanted to update you.
My son has always been difficult when it comes to what hes accepting to eat. I really noticed that it has a lot to do with appetite in his case, sometimes he eats well but mostly not enough. the doctors are not concerned but he is definitely in the lower percentile range.
He used to have eczema that completely disappeared after a few doses of rhus tox 6x, Baryta carbonica also helped him a lot but I feel like it doesnt so much anymore.
Lately, he had a cold with a lot of mucus and when I gave him Kalium bichromicum, I was very surprised to see how much it improved his appetite, he never ate so much. So I gave kalium bichromicum 3 times in 6x but he started to have flatulences which smelled bad, so I increased the potency to 9c but suddenly he had no more appetite again. So I dont really know what to do at this point. I was thinking about Kalium carbonicum but I am not sure.
He is quite short and thin, his sleep is quite agitated: moving and crying in his sleep. he gets easily upset and when tired he can get very angry. he has difficulties with speech, instead of saying the words, he is often miming them with gestures. He understands very well everything we talk about and he is very active, he loves doing things by himself. He also loves being outside. he likes eating sweet things like chocolate and everything spicy or acid like pickles.