97 to 100.3 degrees Fahrenheit
In infants from birth to 3 months old, an abnormal temperature--either too low or too high--can be a sign of something serious. A baby with a low body temperature may have a serious infection, according to MedlinePlus.com, and an infant with a fever requires an immediate call to the doctor. Photo Credit baby image by Dron from Fotolia.com. An infant up to 3 months old has a normal body temperature range of 97 to 100.4 degrees Fahrenheit, 36 to 38 degrees Celsius, according to the American Academy of Pediatrics. Temperatures both higher and lower than this range are a cause for concern A baby’s temperature is no different. According to the American Academy of Pediatrics, normal body temperature for a health baby ranges between 97 degrees and 100.4 degrees Fahrenheit (36 degrees to 38 degrees Celsius). A rectal temperature reading above this range indicates a fever. Contact your doctor immediately if your child is less than three months old and has a temperature of 100.4 degrees Fahrenheit or above. If your child is older than three months with a fever of 102.2 degrees, call the doctor to inquire if she should be seen. A normal temperature in children is about 36.4C (97.5F) but this does differ slightly from child to child. A fever is usually considered to be a temperature of over 37.5C (99.5F). You may be concerned that your baby has a fever if they: 1  feel hotter than usual to the touch – on their forehead, back or stomach.  Most people think of a normal body temperature as an oral temperature of 98.6°F (37°C) . This is an average of normal body temperatures. Your temperature may actually be 1°F (0.6°C) or more above or below 98.6°F (37°C) .  In infants under 3 months of age, any fever of 100.4 degrees Fahrenheit or higher should be reported to a doctor. For babies older than 3 months, the benchmark is 102 degrees. Newborns who have a rectal temperature of less than 97 degrees should also be seen by a doctor. Normal Temperature. Normal temperature for a baby actually depends on what method you use to measure it. The 98.6 benchmark is generally for temperatures taken orally, but you can't measure temperature this way in a baby. A higher-than-normal body temperature is called a fever. A fever is usually a sign that the body is waging a war against infection. Taking your baby's temperature can confirm your suspicions and help you and your child's doctor figure out the best way to get your baby back on the road to health. Most doctors – and the American Academy of Pediatrics (AAP) — agree that a normal body temperature for a healthy baby is between 97 and 100.3 degrees Fahrenheit. If your baby's rectal temperature is 100.4 degrees or higher, he has a fever When to See a Doctor. If your baby is under age 3 months and has a fever, take her to a doctor. For at least the first 6 months of life, call your doctor anytime she has a fever. At your baby’s next checkup you can ask if the doctor has a “fever policy.” That will give you a better idea about when you need to call. 
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what is normal body temp for a baby