reassuring 7

from 4 months and a half, we hear very well, the sound is very clear, the difficulty being to take his time to find the baby at this age is still small, little tip: Use the semi-recumbent, and put it under a navel, do not forget that the baby's heart beats much faster than ours, and even if the cord flow is meant the easier it is also reassuring to hear his heart, because it flows also means that the child lives. I lost a baby at 6 months pregnant and ca allows me the days when he moves little feel better, however, I recommend using it every five minutes because we would end completely paranoid.
Vaseline (much cheaper in pharmacies) is very effective, because the tube does not allow more than 5 or 6 uses, it can also put water puts it causes loud noises when you move the device to the contact being more inferior one takes longer to find.
in short, a great device