A three-year-old baby with a chicken chest is not serious, it is a mild chicken chest, you can give calcium gluconate, vitamin D, to often go outdoors for sun bathing, in the process of later growth and development, the chicken chest may correct itself. If the effect is not good, three-year-old babies can be treated with a chicken chest brace, wearing a chicken chest brace for two hours twice a day, which can be corrected generally in 2-3 years. If the effect is not good and moderate or severe chicken chest appears, surgery can be performed to correct chicken chest to avoid the impact on heart and lung function.