Electric toothbrushes are the new fad. We usually recommend electric toothbrush for kids who have trouble brushing due to special needs or lack of neuromuscular coordination. To improve hand eye coordination and to develop fine motor skills always manual toothbrush is recommended. If u feel ur kid will brush better with electric toothbrush there is never a problem with giving it a try. Do make sure the electric brush reaches all areas of the mouth. Monitor ur childs brushing especially at night.

Kids Toothbrush: Best Options for Your Child's Oral Health - Dentaly.org