What are appropriate heart rates for a 6yo resting to sitting to standing. 48lbs. 44in. Resting heart rate typically 100. Goes to 145 with dancing.?

In a normal child... Resting heart rates and exercising heart rates can be like those numbers, in a normal child. That being said, having those "numbers in the normal range" does not confirm anything about a child's health status (they're just numbers). If there are worries, a parent can bring them up at the annual check-up, or make an extra appointment sooner to talk about them.