Help! Gave prune juice to 8 week son & he's crying and in pain, gas, cramping

Amanda • First time mommy! Rainbow baby! Due May 30! My hubby is in the Air Force and stationed in Las Vegas , Nevada. So excited
He's in so much pain.. He is crying so hard and has gas and just is so uncomfortable . He wakes up crying , wailing... I've done bicycle legs, I've done the belly massage. Please help!!! How do I comfort him ? How long does it take for the prune juice to leave his system ? He hasn't had a bowel movement yet. It's been about 12 hours. Thank you so much mommies