my 9 week old has slight temp what to do?

[squidipa]

i have a 9 week old with 37.6 temp been like that since 6am, first feed. I am taking temp under arm is that half a deg diff than the real temp?? how long can babies go for with temp without medical check up

no rash or irritability or lethargic he seems fine just has temp

should i be concerned?

i have stripped him back and wet flanell im not concerned on how to treat the temp just rather at what point of the pro longness should i seek a dr and is the temp really lower than real temp when taken under arm?