I have 2 sets of twins, ages 2 1/2 and 3 1/2 (one year and 2 days apart!). The younger set was diagnosed with autism in June and one of the older  set of twins is currently being evaulated (we know he has severe sensory issues, but want to rule out being on the spectrum). Since last year, the younger twins with autism have come a long way in terms of socialization, however, they still have limited communication and do not gesture or respond to their names at times. One of them is just beginning to walk and the other one was walking some a few months ago but stopped suddenly. Our OT seems to think the sudden loss of desire to walk is associated with his sensory problems and somehow related to the fact people of the spectrum sometimes lose skills. The PT and I aren't sure we agree. I know spectrum kids lose skills, but have not found or heard of any cases where they lose walking abilities. Does anyone know of such a case? We are meeting next week with our pediatrician to determine if another MRI is needed (he had one a year ago to rule out hydrocephalus). He will walk with handholding, but with some protest. He acts like he knows "how" and marches his feet, but can't get going. Thanks in advance for any thoughts you may have.