Could u please sugest how much quantity of formula milk(in ml) is adequate for a 3 month old baby who have just started drinking from bottle.?

~900 ml.: Your average infant can fit ~ 30ml/kg into the stomach per feeding and a 3mo weighs~5.5kg. An intake of ~900ml of regular formula will acheive 110cal/kg to sustain basic growth. Many will take a bit more.

24-30 ounces per 24: 24-30 ounces pr day is pretty average. Once you get above 32 ounces per day, you are beginning to push into "too much", and certainly anything above 36-40 ounces is over feeding. Most 3 month olds should feed 4-5 ounces per feed, every few hours and begin to sleep a little longer stretch at night, like 5-7 hours.

It depends approach : Feed enough so that he is satisfied for 2-3 hrs but not too much that he spits up repeatedly (spitting up once might be normal in most babies). Check with you doctor to make sure baby is growing well (not too little or too much).