mybat, you may be better off if you share less information with her. When my children were very young, I used to call my mother-in-law after their check-ups to let her know how much they weighed & how they were doing. Once I called her after my son’s check-up & she asked me if I had allowed him to receive the MMR (measles-mumps-rubella) vaccine. When I told her that he did receive it, she told me it would probably make him autistic, since she knew someone whose child stopped talking shortly after receiving it.
Most of my children started talking late, and my mother-in-law knew I was concerned about that, so I did not find that comment helpful. But I did learn to stop discussing my children’s health & development with her.