How should a three-month-old baby drink 300 ml milk a day?

Three-month-old babies normally milk at least 800~ 1000ml every day, 5~6 times a day, with an interval of 4 hours, each time 150~200ml. If you say that the baby's total milk volume is 300 ml a day, it is even less. You can observe first, but if you really can't, consult a pediatrician.