A 3-year-old boy presents to your GP with his mother. They have recently registered with your practice, having just moved to the area. The boy mobilises with a pushchair for long distances but walks with a scissoring gait over short distances. On examination, he has increased tone in his legs with previous tendon release surgeries. His mother says that his nursery performance is good and he is learning well, however, she tells you that she is worried he has not reached all his motor milestones. As the clinician, what is the most appropriate next step in management?