WHAT SHOULD I FEED MY 15 MONTH OLD?

my 15 month old son is a bit of a fussy eater 1 day he will eat perfectly the next he will just shake his head and cry! he gets poorly quite alot maybe thats why he doesnt want to eat all the time...was just wondering thou if anyone can give me some insight into what they feed there little one on a rough day including baby milk and whloe millk/juice ect, i struggle to get him to drink much.. on a good day he will have on waking 6am..7oz progress milk 10.30am porridge and 7oz progress milk 2.30ish dinner 2 small yogs after his baby food currently on mashed with a few lumps (can eat spagetti brilliantly)with juice when he doesnt screw his face up! then hell have 8oz progress milk at 7pm for bed! he has the odd biscuit,raisins apple through the day occasionally when he wants it to! he isnt the best sleeper either often waking alot through the night and wanting a bottle between 1-3 am.. help please lol thanks