Ay, nakakabahala talaga yan! Could be heat rash, diaper irritation na umaabot sa paa, or even just a minor bump, babies get red marks so easily, pero importante i-monitor mo kung kumakalaot siya or kung lumalaki pa. Better check with your pediatrician agad lang para sure, lalo na kung may discharge or kung parang mainit ang area, because at 3 months kailangan natin maging extra careful!