This information is provided by the American Academy of Pediatrics.  For the complete first aid guide, click here.

For stinging insects, remove the stinger as soon as possible with a scraping motion using a firm item (such as the edge of a credit card). Put a cold compress on the bite to relieve the pain. If trouble breathing, fainting, or extreme swelling occurs, call 911 or an emergency number right away. For hives, nausea, or vomiting, call the pediatrician.

For spider bites, call the pediatrician or poison center and describe the spider. Have the pediatrician check any bites that become infected.

Important note: The information contained here should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances.

Source First Aid (Copyright © 2011 American Academy of Pediatrics)