My 19-month-old grandson is my son's and daughter-in-law's first and only child. He lives with me as do his parents. I see my grandbaby everyday. He had a severe regression after his 12 month immunizations. Before the immunizations, he could say a few words, was very social, was very happy, always wanted to play. 

Now at 19 months, he does not say anything, no words at all. He will babble once in awhile. And by once in a while I mean a couple of times a week maybe. He will not make eye contact and if I try to insist on it he gets very frustrated. He walks on his toes almost constantly. He does not respond to his name ever, or requests of any kind. He has a habit of severe hand flapping, he will stand and flap his hands like he's trying to fly. When he sits down to play with toys, he doesn't play with them. He takes them and puts them behind his back. Once all the toys are behind his back, he turns around and does it again in the opposite direction, puts all the toys behind his back. He does this with food also, tries to put it behind his back. He wrings his hands and also does that behind his back. 

I am terribly concerned about autism, but my son and daughter-in-law have no fears whatsoever. They insist that there is absolutely nothing wrong. I've tried to talk to my son and daughter-in-law. They are in complete denial that there is any problem with their child. They usually don't get to see the pediatrician unless the baby's ill and well check ups and shot checkups they see a PA and a nurse and that's it.

I've taken care of hundreds of children. My own two for starters. My younger one being born with a brain malformation, needed years of speech and physical and occupational therapy. I was a special education teacher at several schools. 

I am at my wit's end but have thought of contacting their pediatrician. He was also my children's doctor. I know he can't relay any medical information to me, but maybe this might be of help for him to start a conversation at the next appointment. I don't know what to do.