You must reach the minimum specified height: 1,20 m (4')
Just for mum and dad : the young kids option
If your child is not permitted on the attractions with dynamic seats, you can take it in turns to see the attraction without having to queue twice. Ask a host or hostess at the entrance to the attraction for details.
Health restrictions apply:
you must be in good health with no physical disorders (heart or spinal problems or motion sickness) ;
mothers-to-be are not permitted entry to these attractions ;
non accessible to wheelchairs, transfer to the seat required or seats reserved (more information here).