With so much to worry about when it comes to kids, it's hard to decide which health concerns are valid and which are less serious. For example, many parents freak out when their child gets clocked in the noggin, but much of the time, a bump on the head will result in nothing more serious than a lump. The skull is built to withstand a surprising amount of force. After a hit, check your child for bleeding, then monitor him for a few hours. Causes for concern include loss of consciousness, vomiting, disorientation, sleepiness and pupils that don't look equal in size - any of these symptoms warrant a trip to the doctor. Fevers are a frightening and potentially serious problem in kids, but parents panic unnecessarily sometimes when the thermometer's mercury surpasses 98.6.