Nose bleeds are normal in healthy children, but some may experience nose bleeds more frequently than others. While the condition is relatively easy to treat, encouraging healthy habits may help reduce the frequency of nose bleeds for your child. (Stockbyte/Stockbyte/Getty Images) A nose may begin to bleed when one of the small veins lining the nose bursts or ruptures. Generally, this is caused by normal child behavior such as picking the nose, blowing into a tissue too hard or trauma to the nose during play.