I'm subscribing for some tips too. I've been umming and erring about one too. I had an ear one but it is too big to get in their ears properly to get an accurate reading - I even brought the kids one. I have heard good and bad things about forehead ones - they can give inaccurate readings if bubby is clammy/sweaty. I use the one under the arm but it getting harder to use as bubby gets bigger and more wiggly. Going to be interesting to see what others say.