My son is butt scooting super fast but not walking or crawling yet. Pediatrician is not super concerned because he has came a long way in the last few months (going to Physical therapy and starting to scoot). He had an xray and hips are fine. Just wondering if anyone else is in this situation and if so what you've done. He does have low muscle tone in his lower legs and she thinks this may be contributing to delay in walking.