Babies and toddlers are not very well-developed in terms of gastrointestinal function, and watery stools are often caused by digestive problems, such as indigestion or a cold stomach. It is important to pay attention to the diet of infants and toddlers, as they are generally breastfed at the age of one week, and if supplementary food is added, it is best to choose easily digestible food and to eat a light diet.