How to choose bicycle for kids?

Here are some data for your reference.  

Age of your kids

2--5 years (85mm--110mm):  10"--12" wheelsize kids' bike

6-8 years(110--130mm)   : 14"--16" wheelsize kids' bike

9--12 years(130--150mm): 20"  wheelsize bikes

12--14 years(150mm--165mm): 24" bikes  

Hot sale bicycle for children:

Brand	Newtimes , Ocean,Ganna
Model	TY-16-014
Type	Kids' Bike
Training Wheels	Yes
Wheel Size	16"
Frame Material	Steel
Fork Material	Steel
Rim Material	Aluminum Alloy