does anyone know of any toddler having bad side effects from shots?

I would like to hear from people that have a child, or know someone that has a child that suffered any kind of damage as a result of having their immunizations. i am suspecting some problems my 2 yr old grandson is having is from his 18 month shots. or maybe his 1 yr. even. he used to be able to talk like a normal child till shortly after them, and we can find no other reason for why this is happening. he went from saying many words, to just a few, then now even less, and the ones he does say, they are getting harder for him to pronounce. he is seeing specialists to try and figure this odd thing out. he is not autistic. he has learned some motor skills late, like he never use to point til lately, and he just learned to open doors that twist but he is smart and understands everything that is said to him. he has no problem in that area. if u have any other suggestions as to what may be happening to him, i am all ears. this has got me baffled, and so far nothing from doctor. but would they admit if it were cuz of the shots? i am hoping to get to the bottom of it soon so we can help him before it gets worse. i appreciate your time, and any input that u can give me. even if it is opinions and ideas. it does not have to be something u know to be fact. just trying to investigate all possibilities. thanks again!