Compression-to-ventilation Why Does The Compression To Ventilation Ratio For Pediatric CPR Depend On The Number Of Rescuers?

Why does the compression to ventilation ratio for pediatric CPR depend on the number of rescuers? - compression-to-ventilation

If you lead CPR on a child, why is that the compressions and breaths in a ratio of 30:2 to 15:2, and for coordinating the ratio of two lifeguards lifeguards, but in the adults perform CPR for a 30:2 ratio and two rescue teams?