The child’s vagina is very red and painful may be infantile vaginitis, you can use benzalkonium chloride lotion cleansing, local application of erythromycin ointment anti-inflammatory. The child’s vagina is very red and painful, must pay attention to hygiene and cleanliness, keep the pubic area dry, you can take part of the vaginal secretion to send a test, it is very likely to be infantile vaginitis. Infants and young children’s underwear should be washed separately from adults, if it is caused by the stifling of diapers, should minimize the use of diapers, diligent replacement. In terms of treatment, you can use benzalkonium chloride solution to wash the child’s vulva every day, and if the child’s vagina is red, swollen and painful, you can apply erythromycin ointment to reduce inflammation and relieve pain. Diet should pay attention to light, do not eat spicy stimulation. Specific medication program should be under the guidance of the doctor.