Taking bets with family...

Sherri • 37 / Engaged / Proud mommy to hyper 6yr old / Expecting our 🌈 rainbow twins in June '18

We are expecting DiDi twins in June and i was reading about different theories and wives tales. I'm not 100% sure how acurate they are for multiples. But if I'm doing it right, according to the nub, skull and heartbeat theory, Twin B is a boy and Twin A is a girl. Anyone else have any theoretical guesses? First pic is Twin B and 2nd pic is Twin A. Heartbeat

for Twin B 155bpm and for Twin A 165 bpm.