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Babies change fast — especially in that first year and a half. You finally learn the rhythm, and a week later it's gone. Naps shrink, bedtime shifts, and you stop trusting your own memory of when anything actually happened.
That's when the math starts. How long did she sleep? When did she wake up? When should the next nap begin? You run the numbers in your head, half-asleep, over and over — and it never quite feels reliable.
Moms' Math doesn't fix the chaos. It just gets the math out of your head, so you can see the patterns clearly — for yourself, or to show your partner, your pediatrician, or a sleep consultant when you need a second opinion.
— from one tired parent to another