DS is 19 months this week. He used to be fairly good at eating. For example breakfast would be two wheetabix demolished in minutes - sometimes three! - and this was at 9 months old. Today he could hardly finish one.
He refuses all fruit apart from a banana, but won't always eat that anyway.
He used to eat yoghurt, it used to be his favourite food, and now it's not uncommon for him to refuse it.
He currently loves grated cheese. Pasta. Potatoes. Pizza. It's not healthy at all. I try to do lots of healthy meals - hiding healthy food in pasta sauces, of mixing it into mash potato. But he isn't eating as much as he normally would have.
He loves milk, and is happy to drink water. He also loves crisps and biscuits (not happy at DP introducing this to him!) - he'll point at the cupboard where they (sometimes) are and he will scream until I distract him or give in (I only give in if I actually deem he can have a snack).
He seems to be thinning out - although this just could be normal growth? I would have expected him in the 18-24 month clothes three months ago going by previous clothes sizes.
It's not teething as its gone on too long and he currently has no symptoms of teething.
When do I need to start to worry about seeing a GP or health visitor?