Answer:
From the AMC website (Advanced medical certification)
Explanation:
On a child you should go about 1.5 inches down from nipple level and then use two fingers to do CPR (2 inches in when doing CPR). In adults its 2 inches to 2.4 inches in going to the area under their ribs to give the CPR (Because the lungs are there and can push out air by force)
Hope this helped, the website with official information is https://advancedmedicalcertification.com/differences-between-adult-infant-and-child-cpr/
