As far as I know, there are no certain laws pertaining to convertibles. Follow the same seatbelt and car seat guidelines as you would a regular car.
the child should be at least 9 to ride in the front seat
In 15 years old
A child should be at least eight or ten months old for an umbrella stroller.
The laws that apply to sedans are the same ones that apply to convertibles. As long as the baby is in the back seat and is secured in an approved baby seat it can ride in a convertible. But never in the front seat of any car.
12 and 4 foot 9
There is no restriction on age for a passenger. Common sense should be used.
A child needs to be 3 years old!
13
13
8 years old
12
10 or over