There are many reasons that lead to big red bumps on baby’s body, common factors are allergies, scabies and mosquito bites. 1. Allergy: the most common cause of big red bumps on the baby is allergy, children with food or drug allergies, or contact with chemical fiber clothing, metal jewelry and other allergies can be manifested in big red bumps. 2. Scabies: Scabies is a parasitic infection caused by skin diseases, usually due to the baby contact with patients infected by scabies mites or the use of patients who have used the bedding, clothing and infected, often occurring in all parts of the body, in addition to the manifestation of the skin’s red pimples, and there are obvious symptoms of night itching. 3. Mosquito bites: baby red bumps on the body may also be due to mosquito bites, also known as insect bite dermatitis, summer is the season of high incidence, can appear in the baby’s skin red bumps, and sometimes the surface of the small blisters, itching feeling more intense. If the baby has a red pimple, it is recommended to go to the hospital dermatology department.