Aww, rash on baby's cheeks at that age usually boleh jadi dari drool, milk residue, or just sensitive skin lah, a few of us kena this phase jugak! Tapi sebab baby baru 3 bulan, better check with your doctor or clinic dulu to make sure it's not anything yang kena antibiotics or special cream, okay? In the meantime, most of us just clean the area gently with warm water, pat dry, and apply a gentle moisturiser, kalau pakai products, make sure baby-safe je. Let me know what the doctor says!