Baby buttocks with red dots may be diaper dermatitis, allergic dermatitis, heat rash and other conditions. 1. diaper dermatitis: if the baby diaper is not changed in time, after urination and defecation is not cleaned in time, or the use of diapers with poor breathability, due to the baby’s skin is more delicate, very easy to infection, it may form diaper dermatitis so that the baby’s buttocks have red dots. 2. Allergic dermatitis: the baby to the diaper or contact allergy medicine, may also make the baby buttocks have red spots. 3. Heat rash: due to the high environmental temperature, the baby sweats too much, the sweat and can not evaporate in time, resulting in heat rash, will also be manifested in the baby’s buttocks with red dots. Red spots on the baby’s buttocks may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.