You may want to take note of the intake interval of hours, and for gassy baby you massage tummy, do bicycle kicks, tummy time to ensure baby fart, poop. Sometimes they get really hungry and the milk intake would be high.
Both of my children are on BM and in between whenever needed ill give FM. Before their bed time,ill give FM so they can sleep peacefully. Middle night when they wake up, ill feed BM.
Whitety Neo