My 20 mo has zero words, does not imitate words and undertsands very little. He understands maybe 10-15 words and does not follow directions. He sometimes sits if I say sit, will run to the bedroom if I say its diaper change or bedtime will run to the door if I say lets go outside. If I ask guve Dad his shoes or something like that he does not get it. We are seen by a Speech Therapist and are in a play group once a week for toddlers who are behind with speech. My lo is the furthest behind by far. It is scary seeing others much younger than him following directions and talking. We have been seen by a Developmental Pediatrician who currently does not believe it is Autism and wants us to wait and see for now. Has anyone gone through thisnor is going through this? I am worried something is wrong with his cognition.