I just wanted to add, that if you're uncomfortable (it's not your child/a stranger) or unsure about doing breaths, that chest compressions done right can be/are just as effective in moving air in and out of the lungs.
I just recently did a first aid course and they recommended you can just do compressions (adult or child/infant) if that's what you're comfortable with.
It's also interesting to note the differences between the US & UK first aid for CPR. I was taught to do 5 initial cycles of 30 compressions/2 breaths before pausing to evaluate and/or call emergency services if you haven't had someone else call for you as that's how long it takes for the blood to do a full cycle.
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