Hi Sabine,
I have had very similar probs with DS (now 16mos) and have had a lot of advice from child health nurses and a paediatrician. This has helped us a lot and while we still have a way to go we have made heaps of progress. Jack is eating more every day including foods he's been refusing for months.
I think the biggest thing we were doing wrong was giving him too much milk. I also felt that at least if he was eating nothing else than he was at least getting that. But the problem was that he wasn't going to eat more while filling up on milk. I was advised to cut his milk down to 3 times a day, with (pref after food) the main meals. Each time he gets between 150 and 250 mls (approx 5 to 8.5 ozs). He has water at other times during the day. The calcium requirement is 3 serves, 1 serve being 1 cup (250 mls or 8.5ozs). But this includes the calcium from other foods such as yoghurt, custard and cheese.
Another really bad thing was trying to persist with getting him to eat when he didn't want to. This meant he didn't enjoy mealtimes and wouldn't experiment with the food on this own. When we relaxed about him playing with food and not eating or just downright refusing, it changed his attitude too. Now, if he eats he gets praised and if he doesn't we just let it go. Even if he plays with it or spits it out it is showing interest so instead of getting frustrated we chill about it. However, if he doesn't eat what he's given the first time he doesn't get offered anything else. I have been assured that kids won't starve themselves. If they are hungry enough they will eat. If they don't eat a thing just get them out of the high chair and wait until the next meal. This was very hard for me but as I say we have had amazing results so I now think it's good advice.
We were also advised to give him small amounts of vitamin supplements (specially for toddlers). This means that until he is eating better he is getting more vitamins and interestingly it also stimulates appetite. This does seem to have worked with Jack who, as I say, is eating more than I would have ever thought possible.
I hope some of this helps, and I wish you lots of luck. It takes a lot of patience but I'm sure you'll get there in the end. In the meantime, relax!!
Melanie.