LPT: When you (are about to or already) have a baby, get a good waterproof mattress cover. There are tons of fluids that happen unexpectedly

Water breaking

Baby pee

Baby vomit

Toddler pee

Toddler vomit

Hidden baby bottles that leaked

Thrown sippy cups that pop open

That way, you can tend to your family first then reset the bed quickly at those inconvenient times (2am)