My three year old is constantly burping.

You may also want to consider making dietary changes. Most food contain carbohydrate can cause gas, such as potatoes, corn, beans, asparagus, brussels, celery, onions, peas, turnips, carrots, cauliflower, sprouts, cucumber, green pepper, bananas, oranges, pears, prunes, cheese, barley, wheat, oat bran. In contrast, fats and proteins cause little gas. Cutting down on food that cause gas may make a big difference, however, the amount of gas produced by food may varies from person to person. You need not eliminated gas-producing food entirely unless your kid has certain food sensitivity. You can try trial and error method to determine his own limit. Sometimes eating in smaller quantity will reduce flatulence.