My daughter was born with a lot of hair on her head and a little on other parts of her body. She's got a VERY thick head of hair now (she's almost 10 y.o. now).
The hair may not have anything to do with the "cramps".
Maybe she just has gas.
Both my daughters got very gassy especially after starting to "eat" baby food/solids, etc.
If it's gas, Mylicon gas drops will take care of it.
And Mylicon is a lot cheaper than an endocronologist.
It's just a thought.
Maybe you could try this and see if it helps.
Also, Michele S. has a point too. Even though babies poop, sometimes they're constipated anyway. A little watered down prune juice or pureed prune baby food will help with that too.
Hope this was helpful!
Good Luck!