Six-month-old babies with white spots on the gums are considered to be caused by tooth eruption, thrush, mouth ulcers and so on. 1. tooth eruption: six-month-old babies are budding stage, in the tooth eruption before the gum area, there may be redness, swelling, pain and discomfort, the gums after the eruption may appear white spots, is the new eruption of teeth. 2. Thrush: mainly caused by oral infection with Candida albicans, the white spots on the gums are white pseudomembranes, often accompanied by obvious pain symptoms. 3. Mouth ulcers: an ulcerative injury that occurs locally in the oral mucosa, may be due to the baby suffers from mouth ulcers, resulting in ulcerated spots on the gums. Six months baby white spots on the gums, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.