Hi Charlie, from what I have read babies this age need about 600ml of milk a day, but it is stressed that until they are 1 year old, milk should be their main source of food and aolds jut for fun. What I do with my son is I decrease his milk intake for the feed just before his solids, that way he is peckish for lunch. I find that he doesn't like cereals and prefer home made purees and for cereals he has at most 2 tablespoons before he refuses.
Good luck