Snuza Hero Baby Monitor has over 1500 reviews on Amazon. We can't vouch for how it works, but there are lots of videos and ratings that report it's better than nothing.  Some parents love it.  Some don't.

We LOVE that we did NOT detect any emf. No magnetic energy. No RF energy was detected with our meters. Snuza portends to detect even the slightest irregularity in baby’s abdominal movement. Clip the Snuza Hero onto the waistband of your baby’s diaper and switch on. Snuza Hero. The unit says it will will detect your baby’s every movement and will alert you if your baby’s movements are very weak or fall to less than 8 movements per minute. 

If you're looking for a NO EMF BABY MONITOR- We Have a Great DIY Solution!

We tested the Snuza Hero for EMF Emissions. Scroll down and watch the video.