Remember, a tool is designed to listen to fetal heart tones only
Description
Detection is barely as early as 24-30 weeks, but the best chance should be around 30 - 36 weeks to hear the faint tones. Normally undetectable from 0 - 24 weeks. A mother must lie in a comfy and quiet area (do this in a very silent room since the fetal heart tone will be very faint)