Keli is right,
However it also depends on the individual. we took Theos Temp when he was born, and he has always had a temperature of 36oC. which is below "normal". so a temperature for him is 37oC'ish.... i was always told that its a good idea to take temperature regually to find this out.
one of the things we ask for at the nursery i work at is "usual body temperature of child" that way we know if they are running high or not.
xxx