If a newborn has bumps on the legs, it is mainly caused by the following situations: 1. Newborns suffer from insect bite dermatitis, if the newborn is bitten by mosquitoes or other insects, it will lead to small bumps on the legs. In addition to the bumps on the legs, the bumps are often very red around the itchy feeling is very obvious, the newborn will involuntarily scratch the bumps with their hands, in this case, you can apply flower lotion to the newborn for treatment. 2, newborns suffering from eczema caused by, if the newborn belongs to the allergic body, allergic to milk protein, it will lead to the symptoms of allergies, the most common is the bumps on the legs and diarrhea, etc. In this case, the newborn can be tested for allergens, and if the allergy to milk proteins is confirmed, the formula should be replaced with amino acids in time.