Does your baby's heartbeat sound like a horse or a train?
The theory goes that if your baby's heartbeat sounds like a train, you're having a boy and if it sounds like a galloping horse, you will be expecting a girl.Girl galloping horse heartbeatNo, the heart rate cannot predict the sex of your baby. It goes without saying that with these kinds of things there is always a fairly good chance anyway as it's 50/50 but if your upcoming arrival's heartbeat sounded like a horse and indeed ended up a girl, this would simply be a coincidence.
Babies generally have faster heartbeats than adults anyway which might explain why they can sound like a horse or train. But ultimately, experts have found no evidence that a heartbeat that sounds like a horse indicates a girl while a train-sounding heartbeat will mean a baby boy.