Normal lah, biasanya newborn yang mixed feeding (formula + breastmilk) berak 2-5 kali sehari, tapi setiap baby lain-lain je frequency nya depending on digestion. Kalau poop nya kuning, soft-pasty (tidak keras), dan baby seem happy dan gaining weight, should be fine lah, a few of us dalam group try mixed feeding juga and our paediatrician kata that's the range to expect. Kalau dia berak banyak sangat sampai nappy basah setiap jam or the poop jadi water-like, baru perlu check dengan doc, but normal brown/yellow soft poop a few times a day is totally OK!