The world is, indeed, topsy turvy. Kinda like this baby set.
Topsy Turvy is comprised of a top-down hat and toe-up baby booties with a forked heel. Babies have pronounced heels and fat feet, so making baby socks that fit can be difficult. The forked heel helps out by creating a longer, wider heel that will stay on.
A common cast-on technique for toe-up socks also doubles as a cast-on technique for the top-down hat. This adaptation takes the pain out of small-circumference circular cast-ons and might just win you over for your next shawl, too.
Basic 2×2 ribbing is flexible enough for new parents to get squirmy babies into both the socks and the hat.