You may have to move your fingers around a bit to find the beat. When you find it, count the number of beats in one minute. Have someone else watch the clock while you count the beats. Now do an exercise, like jumping jacks, for one minute. Then check your pulse again.
Children have faster pulses than adults.
This is true even when children are resting. Babies have even faster pulses. So since babies are so small it takes less time. Once I did my jumping jacks my heart beat a lot faster. My jumping jacks made my heart work harder.