At 7 months, most babies are doing around 3-4 bottles a day with solid foods na, so usually every 4-5 hours between feeds, pero honestly, it really depends sa baby mo kung gaano siya kumain ng solids! One of my mum friends' baby ay less interested sa bottle once she started eating well, while mine still wanted the same amount kaya you just have to watch your baby's cues. If your little one seems hungry before the usual time or leaves milk, adjust lang accordingly, walang strict schedule talaga kahit may general guideline.