The Angle care movement and sound monitor is a monitor that comes with peace of mind. 

This monitor comes with a sensor pad that you place under baby's mattress that detects movement.  The monitor can be sound only, sound and movement, and sound and movement with a tic noise to indicate baby's movements. 

I got the Angle Care monitor when my first child was born three years ago.  My daughter only weighed 5 pounds and I got it for peace of mind.  Turned out to be a really smart choice because she would stop breathing occasionally throughout the night and the alarm would sound after 20 seconds...