Bulging gums in babies can be the result of diseases such as gingivitis and apical periodontitis. It may also be a normal reaction to the period of tooth replacement. 1. Gingivitis: gingivitis is usually caused by localized plaque, or it may be caused by misaligned and crowded teeth, food impaction and other factors. Affected children will have swollen gums, manifested as bulging gums. 2. Periapical inflammation: Periapical inflammation may be caused by bacterial infection, physical irritation and other factors. Some children may have bulging gums. 3. Teething: The baby gums bulge without symptoms, consider may be in the period of tooth replacement. Generally do not need to be too nervous, but can also be confirmed by a radiograph. There are many causes of bulging gums in children, parents are advised to bring their children to the regular hospital to find out the cause of the disease.