Where can I find information for normal heart rates for toddlers?

I need toddler heart rate information from a reliable web site. It would probably be a chart, because it would differ from age, active, rest, and sleeping. If you need specific information I would want to know the sleeping heart rate for a 16 month old, 23 pounds.Where can I find information for normal heart rates for toddlers?Should be near 100 or higher