(With, of course, certain exception clauses and special dispensations for the hormonal havoc of the pregnancy and postpartum eras. Ahem.)
I can't remember if this is something I read somewhere or whether it was the advice of a wise friend (or both), but here it is, one of those obvious things that I'm always forgetting:
A universal truth of motherhood, especially for those who are managing small children while pregnant or who have an infant in the house: You Will Be Tired. But it's up to you whether you will be tired and angry, or just tired. Or maybe even, with a little extra infusion of grace, tired and joyful.
Just my little "note to self" of the day :O