First of all it is important to remember that bike helmets are safety equipment and not toys. Standards are put in place to help you in your choice and allow you to turn to reliable helmets in terms of security.
First of all it is a well-known physical phenomenon. Think of the stools, to stand up the minimum is 3 legs ... on 2 legs we fall. Also the 3-wheels scooter offers a natural balance, as on the bike with small wheels. When for a classic 2-wheels scooter you have to find the point of balance, with 3-wheels models your child can let go of the handlebars and the scooter stays upright.
The great return of the scooter does not only concern busy city dwellers, dogs also find their account in this new trendy activity for dogs and their masters !
The safety of children in scooter or bike riding should be a constant Priority.