Aw mama, I totally understand your worry! At 3 months, maraming babies pa talaga ang may flat spots dahil sa positioning, pero honestly this is something you really need to bring up sa pedia para sure, hindi kami magagawa ng remedy na tama without a proper check, kasi may different types ng flat head and some need early intervention pa. One of my mum friends had the same concern at ang pedia niya recommended repositioning during tummy time and varying how baby sleeps, pero kailangan talaga i-assess ng doctor kung gaano kalala para ma-guide kayo properly, better safe than sorry diba!