They often wheeled the ultrasound in to make sure bubs was still alive and her heart was okay but she would hide or kick & move everytime the doppler came on obviously avoiding it. Even now when I have midwives appt and they put the doppler on, they may get 10 seconds or so of a HR but bubs really hates it because she kicks it & tries to get away from it.
And people say that babies are not affected by ultrasound! Dopplers are short for "doppler ultrasound" and thus suffer all the disadvantages standard ultrasound. I am surprised that some people in this thread want to buy or rent them for their own use. They are highly useful as diagnostic tools when required, but should, like any diagnostic technology be used sparingly.

David