You need a really good quality one. Some are not that great. You can use them to hear baby.
^^^ yes you can hear your babies heart with one. There are still midwives that use one instead of a Doppler. And it even tells you on this app if you watch the video they put up for weeks 25-28 that you can.
You might be mistaking what you read. I've never seen it written anywhere that a fetal heartbeat can be heard with a stethoscope, and certainly never had a doctor listen to my stomach with a stethoscope when I was pregnant. You might have read that the baby's heartbeat can be heard with a handheld doppler with a wand. They can be bought from hi-bebe's website for not a whole lot of money (I think $75 to 100) and are very nice to have.
I own one since im in nursing school. Im 28 weeks and couldnt find the heartbeat with it at all, only the doppler.
I've tried but I can't find it either lol. Idk I just usually give up after a few try's.