1. What is prickly heat? Prickly heat is a common skin disease, also known as sweat blisters and sweat spots. It is the formation of small blisters in the pores due to the inability of sweat to drain properly. Prickly heat is very common in babies. The main reason is that babies have tender skin and developed sweat glands, making them prone to sweating. 2. Reasons why babies get prickly heat 1. High temperature: High temperatures and high humidity in summer will cause babies to sweat more and easily get prickly heat. 2. Improper dressing: Overdressing or wearing non-breathable clothes in summer can cause your baby to sweat excessively. 3. High humidity: A humid environment will make pores more likely to be clogged. 4. Improper bathing: