Ay, ang "an an" sa mukha ng babies at toddlers talaga! Kadalasan yun ay heat rash o prickly heat dahil sa init at sweat, lalo na dito sa Pilipinas, tried-and-tested ng aming mom group is baking soda paste or plain cornstarch powder para mag-dry ang skin, at laging i-keep dry at cool lang, especially sa neck at skin folds niya. But honestly, better check with your pedia para sure kung ano exactly at kung may bacterial infection na, because some rashes need proper medication talaga, yah? If it's spreading or nag-ooze na, don't wait lang.