The redness of the glans in the foreskin of a 3-year-old baby is usually related to foreign body irritation, glansitis, prepuce or hypospadias and other factors. 1. foreign body stimulation: for example, pants are too tight or underwear material is hard, easy to repeatedly stimulate the foreskin as well as the glans tissue, which leads to 3-year-old baby foreskin glans red. 2. glansitis: with poor personal hygiene, do not pay attention to local hygiene, repeated inflammatory stimulation, may cause glansitis, which leads to 3-year-old baby foreskin glans redness and edema, and will be accompanied by pain, itching and other symptoms. 3. Phimosis or phimosis: If the 3-year-old baby exists phimosis or phimosis, usually do not pay attention to cleaning, not often clean up the foreskin scale, will also cause the redness of the glans penis, and accompanied by edema, congestion and other symptoms. 3-year-old baby redness in the foreskin glans, in addition to the above factors, but also may be skin allergies, scrotal moisture caused by the proposal as soon as possible, identify the cause and then targeted treatment. Before the cause is not clear, do not take medication without authorization.