Milk Strike

My 2.5 months old baby is rejecting milk, both bm and fm. She struggled and kick a fuss whenever we tried to feed her. The only time she willing to drink peacefully is the 5am feed. From an avg of 700ml per day, she is only drinking on avg 400ml now. I have tried changing bottle and teats, and even dreamfeed. Yet nothing seems to work. Anyone facing this problem?