Most parents call their pediatrician when their child has a high fever, however, it is important to keep in mind that a fever is not the only sign of a serious illness. Whether or not your child has a fever, if he is very irritable, confused, lethargic (doesn't easily wake up), has difficulty breathing, has a rapid and weak pulse, is refusing to eat or drink, is still ill-appearing even after a fever is brought down , has a severe headache or other specific complaint (burning with urination, ear pain, if he is limping, etc.), or if he has a fever and it is persistent for more than 24 to 48 hours, then you should call your pediatrician or seek medical attention immediately.
FeverFever is not a disease, instead, it is a symptom that can accompany many childhood illnesses, especially infections. In general, you should call your pediatrician if your infant under three months of age has a rectal temperature at or above 100.4 F., if your infant aged 3-6 months has a temperature above 101 F., or if an infant above 6 months has a temperature above 103 F.
For most older children, it is not so much the number, but rather how your child is acting that is concerning. If your older child is alert, active and playful, is not having difficulty breathing, and is eating and sleeping well, or if the temperature comes down quickly with home treatments (and he is feeling well), then you don't necessarily need to call your doctor immediately.
Also, you should call your doctor if your child has a fever and another medical condition (heart disease, cancer, sickle cell, immune system problems, etc.).
VomitingVomiting typically accompanies diarrhea as part of an acute gastroenteritis or stomach virus in kids. It is usually not concerning if your child has only vomited a few times, is keeping small amounts of fluids down, doesn't have significant abdominal pain and is not dehydrated.
You should seek medical attention for vomiting if your child is developing symptoms of dehydration (urinating less often, dry mouth, weight loss, etc.), is vomiting dark green bile (bilious vomiting is a sign of an intestinal obstruction), is a newborn or young infant with projectile vomiting (pyloric stenosis), or if he has a severe headache or abdominal pain. Vomiting is especially concerning if it begins after your child already has abdominal pain, which often happens in children with appendicitis.