Dear @worriedmum Most nosebleeds are not serious and will resolve by itself. It is important to teach your son not to pick his nose or rub his nose too hard as the blood vessels at the front of the nose is fragile and will bleed easily. In the event, if his nose bleeds again, you can perform first aid by pressing on the tip of the nose that is soft. Remember to ask him to breathe through his mouth when the nostrils are pressed closed. You can wrap some ice with clothe and place them around the nose to reduce the blood circulation to the nose, helping to reduce the nose bleed. In the event of persistent nosebleed, you can bring your child to the emergency department where doctors can assist in performing procedures to stop the bleed. Do bring your child to see a GP or Ear, Nose, Throat specialist in the event if he has recurrent nosebleeds to rule out more serious conditions. Hope this helps and your son gets well soon.