My now 15 year old was the worst eater when he was little he would only eat nutella sandwhiches and hot milo he was under weight he was below the lowest percentile on the growth charts and in one year had only gained 100 grams our peadiatrician sent him to see a gastroenterologist (spelling) as they suspected celiac disease anyway to cut a long story short after bowel biopsies ect the specialist ended up finding no reason and said children can live on sandwhiches and cordial with no ill effects so just let him have his nutella sandwhiches and milo and he will eat when he is ready i was worried by the lack of vegies and fruit so got him childrens vitamins and eventually he tried food and started to eat more and more it took years before he would eat properly and reach a normal weight but he did and now at 15 has an expensive pallat like good cuts of meat and eats most of what i cook he just was not interested in food (wish i was like that) so try not to worry they will eat when they are hungry.