For many parents, noticing a rash on their baby’s skin can be worrying — especially when the cause isn’t immediately clear. Babies cannot communicate discomfort the way older children can, so even small changes in their skin often raise concern. One of the most common warm-weather skin issues babies experience is heat rash, also called miliaria. While it may look concerning, this condition is typically mild, temporary, and easy to manage with proper care.
This guide explains what heat rash is, why it develops, how to identify it, and the safest ways to treat and prevent it so your baby stays comfortable and healthy.
What Is Heat Rash?
Heat rash occurs when tiny sweat ducts — the channels that carry sweat to the surface of the skin — become blocked. When sweat is trapped under the skin instead of evaporating, small red or pink bumps can appear. These bumps may be accompanied by mild itching or irritation.
Babies are especially prone to heat rash because:
- Their sweat glands are still developing
- Their skin is thinner and more sensitive
- They can easily become overheated from warm weather, multiple layers of clothing, or prolonged time in a hot environment
Even everyday situations, like a nap in a warm room or sitting in a car seat for too long, can contribute to the condition.