2 doctors weighed in:

What changes does having a fever have on a baby's or child's brain?

2 doctors weighed in
Dr. Alan Levine
Pediatrics
1 doctor agrees

In brief: Usually none

Unless the fever is unusually high-around 106-107-for a prolonged period of time, the elevated temperature usually only causes brain injury to the worried parents.
A frequent concern of parents is that of febrile seizures, which occur in about 5% of all infants and unless related to a serious underlying infection, such as meningitis, also do not cause permanent brain damage or developmental delays.

In brief: Usually none

Unless the fever is unusually high-around 106-107-for a prolonged period of time, the elevated temperature usually only causes brain injury to the worried parents.
A frequent concern of parents is that of febrile seizures, which occur in about 5% of all infants and unless related to a serious underlying infection, such as meningitis, also do not cause permanent brain damage or developmental delays.
Dr. Alan Levine
Dr. Alan Levine
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