Bethany* is like many first-time mothers preparing for the arrival of her baby, attending childbirth classes and setting up the nursery — "really just a large closet more than an actual room," she says — with finds from Facebook Marketplace.

"My husband will hold up the newborn size outfits and announce he doesn't believe it, nobody can be this small," the 24-year-old says, adding she and her husband always knew they wanted kids.