Aiyoh, at 3 months on formula, it's quite normal lah, some babies just drink less frequently as they get older and their tummies can handle more milk at once, so fewer feeds needed. But since you're concerned, best to check with your paediatrician to make sure baby's weight gain and wet nappies are still on track, okay? A few of us mums have gone through this and the doctor always put our minds at ease after weighing the baby!