Are ultrasounds and home fetal dopplers safe?

Kim
Let me preface this by saying I have two healthy children and a third on the way I had 2 ultrasounds with #1 (who is unmedicated for ADHD) and 5 (which includes 1 elective US) with #2 who doesn't seem to exhibit ADHD symptoms as her brother did at that age. This pregnancy, I'll be having multiple vaginal ultrasounds in addition to the normal ones due to cervical issues. I've been reading - nothing scientific - that ultrasounds, particularly vaginal ones, can be harmful to baby. And also that hoke fetal heart monitors are harmful to baby. Do you think this is true?

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