Ay, good question! Ang totoo lang, walang big difference between baby girl at baby boy heartbeat, both around 120-160 beats per minute throughout pregnancy, kaya hindi talaga reliable way to guess ang gender kahit anong mga "old wives' tales" ang sabihin ng iba hehe! Best way talaga to find out is through ultrasound, usually around 18-20 weeks when anatomy scan na, so just enjoy the guessing game for now and then you'll know for sure soon enough!