Ok lets say there is a 15 month old baby boy who has a temp of 102 at what point do you take him in to be seen?

Depends on symptoms: A fever in an otherwise healthy toddler can be managed at home for 2-3 days as long as the child is alert, has good color, drinking fluids well, and does not have problem with breathing in his chest. Often a child with fever will appear sleepy or somewhat listless, but within a few hours of Tylenol (acetaminophen) will be much better.

How does he look?: You should take him to see a Dr. If he looks sick, has decreased appetite, is lethargic, not active, has spots on his skin or if, for any reason, you are worried about his wellbeing. So seeing a Dr. Is not only dependent on how high his temperature is.