D.M.
Sounds constipated. They are too busy during day to notice, but at night, when activity is gone, they feel it. If u know that not to be the case, see physician. Ur husband is not a dr. Always trust your gut. I remember with my 2 nd child fighting with my husband because it was Saturday and we had plans, but bay was crying and wouldn't stop, didn't act right. I insisted on going to the dr. when the nurse asked what was wrong, he sneeringly condescended to her" kids got a tummy ache and thinks that needs a drs attention." That then caused the nurse to treat me brusque and dismissively. The dr came in, diagnosed bad double ear infections(which I'd never dealt with before), and then gave a through oral chastising to my husband and the nurse.
Educate yourself about children and their. Ariel us maladies, don't be an alarmist type mother, but trust your instincts as a mom.