Wake up at 4am for milk

Hi parents, please share me some guides. My baby is 11 months & 21 days now. But almost every night, he wakes up at 4am or 4am plus for milk, n he would demand 120ml +- then only he can sleep back. If there is any delay of milk supplying like I try to pad him instead of making the milk speedily, he would be fully awake from his sleep n started screaming and crawl up and down to play in his crib. His milk in a day is around 700 to 800ml + 2 solids for lunch & dinner. He sleeps around 10.30pm every night. My husband and I r super tired w it. Any help pls?