What is a good resting heart rate for 2 yr old boy? through oximetry study i saw his o2 was great. but hr while calm/asleep was 140-160?

Resting heart rate: The upper limit of resting heart rate in a toddler is approximately 150 beats per minutes. Heart rates can be slightly higher during times of illness and fever. Taking several readings over a period of days to get a more accurate trend would be helpful for your evaluating pediatrician.

Heart rate: There seems to be an important past medical history with your son? As we do not usually check oxygen on a two year old unless there is a reason. So the heart rate may be elevated in a normal two year old who is asleep but not in a child with a reason for it,