Yes. It is safe for them as they are in Kindergarden 2 already.
As far as I know, any child under the age of 12 should not ride in the front seat. Especially if you have a passenger air bag.
the child should be at least 9 to ride in the front seat
Children under 4 cannot legally ride in the front seat. Otherwise, it is suggested that anyone under 12 should ride in the back for the highest amount of safety. If necessary for a child to ride in front be sure to push the seat back as far as possible.
Weight and not size determines when they are able to ride in the front. One of the problems with front seats for a child is the front airbags. The airbags have hurt children because they are smaller and lighter in weight than an adult.
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In Arizona a child must be at least 5 years old to not require a child restraint, however, a child restraint need not be placed in the back seat. It is unsafe for a child of under 12 to ride in the front seat if there is an air bag.
It is never okay for a child of any age to ride in the front seat if they weigh under 60lbs. It is extremely dangerous. If you were to get in a car accident the speed of the airbag is around 200 mph, and the force of that colliding with the child can lead to broken faces, ribs, whiplash, and even death.
In Georgia, a child has to weigh at least 40 pounds to sit in the front seat. If the child is under 8 years of age, he also must be restrained in a car or booster seat in order to ride in the front seat.
Nevada children under the age of 12 need to be properly restrained in the back seat
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Massachusetts state laws state that any child under the age of 12 must ride in the backseat