Thanks for your replies girls.

I ended up ringing Health direct who said to monitor him and take his temp in an hour. If its still 39 or over take him to see a dr.

His temp is still around 38.5 after Panadol and has fallen asleep in my arms without his boobie, that never ever happens, he is usually running around like a tornado until I call him over to feed to sleep, he only has one speed so it's concerning to see him like this