2-year-old children in the middle of the night nosebleeds are due to the following reasons: 1, the most common is due to room air dryness, nasal mucosa brittleness increases after the nasal mucosa capillary rupture bleeding, you can give the child supplemental vitamin C to increase the humidity of the air in the house can be effective in preventing; 2, it may be caused by colds and influenza, upper respiratory infections after the nasal mucous membrane will have germs breeding, the germs can damage the nasal mucous membrane mucous membrane leading to mucosal Blood vessels rupture bleeding; 3, may be blood system diseases, should be timely to the hospital blood test to see if there is a reduction in the number of platelets; 4, a small number of the nasal cavity is due to developmental abnormalities, nasal mucosa and blood vessel abnormalities are prone to the phenomenon of nosebleeds, you should take your child to the Department of Pentacenterology for examination and treatment.