Lactulose is generally referred to as lactulose oral solution, 3-year-old toddler constipation can be taken from a small dose, the specific need to follow the doctor’s instructions. Lactulose can be used for chronic constipation. 3 year old toddlers with constipation is adjusted as needed, it is generally recommended to take a small dose according to the baby’s weight, the specific dosage needs to be used according to the doctor’s instructions. Adverse reactions in the first few days of medication may have abdominal pain, abdominal discomfort, continue to treat most can disappear, long-term large amounts may appear electrolyte disorders. Galactosemia, intestinal obstruction, lactulose allergy, and children with fructose intolerance should be prohibited. Young children belong to a special group of people, such as frequent constipation, it is recommended that regular hospitals, improve the relevant examinations, follow the doctor’s instructions, not blindly self-medication, so as not to delay the condition.