Motion sickness happens when the brain gets mixed messages about motion and can’t reconcile them. When your child’s body feels stationary from sitting in the car but his eyes tell his brain that his body is moving, the body feels sick. That means kids in forward facing car seats get queasy just as often as kids in rear facing car seats (and statistics prove it).
If your child complains of motion sickness, make sure he has the best possible view out the back window by removing your car’s headrest. Things move quickly from side windows, which can confuse the brain even more, but the back window shows movement happening at a much slower pace. To discourage looking out side windows even more, install a sunshade. And try to occupy your child with songs and games instead of toys, books, or TV. The latter require your child to look down, which is a fast way to bring on motion sickness.