my lo is a few days younger than yours. at night we breastfeed exclusively and she will go from 3-5 hours between feeds some nights and then others it can be every 1-2 hours, but these seem to be nights where she has a sore tummy/wind. in the day we combi feed, she'll go every 2-3 hours if she has breastmilk and 3-4 hours with formula.