Because of those three factors, more infants than usual with birth defects were born during those years. Their disabilities include things like deafness, hearing problems, learning disabilities, sensory processing disorders, autism, and many others.
Now that rubella vaccine is available and people are aware that drugs and medications can cause prenatal damage there should be fewer babies born with those problems. But, for some reason, autism seems to be on the rise and, while there are many theories, nobody seems to know why.
Maybe someday they'll figure it out.