Children’s diabetes mellitus is generally divided into type 1 and type 2. Early symptoms of type 1 diabetes mellitus include polyuria, polydipsia, polyphagia and emaciation, etc. Early symptoms of type 2 diabetes mellitus are not so obvious, and are mostly characterized by obesity, and diabetic ketoacidosis can occur in some children. 1. Children with type 1 diabetes: children with elevated blood glucose, due to osmotic diuresis caused by polyuria, followed by thirst and drinking. Due to the loss of large amounts of urinary glucose, the body is not enough energy, the child is easy to hunger, polyphagia. In addition, due to the impaired utilization of glucose in peripheral tissues, fat decomposition increases, and protein metabolism is in negative balance, resulting in children’s growth and development is hindered, manifested as wasting. 2. Children’s type 2 diabetes: children are mainly obese and usually have no obvious clinical symptoms in the early stage. After the onset of the disease is more dangerous, and even an unexplained loss of consciousness, sudden fainting, not wake up, respiratory distress is obvious, at this time the possibility of diabetic ketoacidosis is relatively large. Parents who suspect that children have diabetes, or accompanied by the above symptoms, not unauthorized use of medication, should take the child to the hospital in a timely manner to avoid delays in the condition of the adverse consequences.