gripe water (the type without alcohol in it) really helped my bub in this situation.

i would syringe the gripe water dose in her mouth (she liked it so much, she licked the syringe LOL)
Her tummy would go "gurgle gurgle" very soon thereafter
Then she would poop
Her shoulders would go down, she would literally go "ahhh" and burst into biggest smile
issue over.

when i tried the gripe water (type with 1% alcohol in it), she would make a face like she'd sucked a bitter lemon and refuse to have it.