Perhaps parents' needs should take second place sometimes and those of the children sometimes. A friend of mine left her fifteen month old with me for a weekend when she wanted to stop breast-feeding him. He was her fifth child and she'd had her fill of pregnancy and being a nursing mother. She and her husband continued be excellent parents after their weekend break and their five children seem to have grown up into happy, successful adults who love their parents.
And sometimes they leave their kids with their parents (now the grandparents) so they can have a day or two off work, 'work' there being parenting.
So long as a child is well looked after, a short break from its parents won't do it any harm.