Thank you for your query on Healthcare Magic.
The most common cause for nose bleed in children is nose pricking and dry nose.
Whenever there is nose bleed, press one side of nostril
against the nose bridge till the bleeding stops. Only one side should be pressed at a time to allow breathing from another nostril.
If there are frequent nose bleeds examination and evaluation is needed to look for any underlying clotting abnormalities.
Avoid nose pricking and give him more oral fluids to prevent dryness of nose.
Hope I have answered your query.