 [ Symptoms ] grandson 7 yrs old 49 and 125lbs younger brother tested pos for strep hes vomiting fever slept for 2 days  severe headache has not ate anything but 2 tbs of applesauce wont drink anything just wants to sleep he says his side has been hurting him and the stomach cramps could be from him about to vomit went to doc with the knowledge of younger brother testing pos for strep but was not tested getting worried about dehydration how long should i waite before taking him back to the doctor to be reevaluated   [ Disease ] young babies in day care or preschool can get colds around 3 to 10 times per year with each cold lasting up to 2 or 3 weeks which may feel like all the time they can certainly start getting sick even at a month or two of age virus infections may also happen when a baby is teething it is unusual however for babies to have allergies before 9 months of age and some experts feel kids do not have seasonal allergies until closer to 2 or 3 years old  if your baby does not have a fever and seems to be fine except for the noisy breathing it is probably nothing to worry about but if the stuffy nose interferes with sleep or feeding or if he seems to be in pain be sure to have your doctor check him out