Aww, heat rash talaga yan, common sa ating tropical weather! Para sa 5-month-old baby, the safest approach is talaga to keep the skin dry and cool, loose cotton clothes, frequent diaper changes, at avoiding heavy creams na makakatramp ng init. One of my mum friends swears by letting baby stay sa air-conditioned room during the hottest hours, at para sa immediate relief, she uses soft, damp cloth to gently pat dry lang, walang rubbing. But honestly, if it's spreading or looking red and angry, mas better to check with your pedia just to be sure it's heat rash lang at walang infection na nag-develop. Mukhang first-time mom ka, kaya wag mag-worry, heat rash sa babies ay super common and usually goes away on its own with proper care.