Milk intake for 15mo

Hello! My LO is currently on 3 meals and occasionally snacks on fruits after dinner. Is his milk intake too little? He’s been refusing the last feed before sleep time. Am concerned if I drop feed, he’ll wake up in the middle of the night and not sleep through the night. He’s on FM now. Appreciate any advice, thanks! 7am wake 730am 180ml milk 9am breakfast (baby cereal/bun) 12pm lunch (porridge) 3pm 100ml milk 6pm dinner (porridge) 830pm 60ml milk (used to be able to drink 180-210ml)