I know it’s only $15 but don’t waste your money, no matter how curious you are. You go to the OB once a month, you hear the fetal heartbeat, be satisfied. Don’t be like Tom Cruise and buy an ultrasound machine at home because you need to monitor the baby’s every minute in the womb. There might be more expensive real Doppler fetal heart monitor that actually does what its supposed to but this Graco Prenatal Heart “Listener” (they don’t even call it a monitor) only allows you to hear your own heartbeat (and heartburn if you are experiencing that). It is pretty much an amplified stethoscope. I guess you could use it as a stethoscope to listen to your tot’s lungs when she’s sick, but again, I would probably defer to a doctor and take your tot to one instead of diagnosing anything yourself at home (unless of course you are a pediatrician!).