All right, as promised, here it is. I've discovered that using the same pattern with 2 different hook sizes works to make the couple of sizes that my local NICU requests most, so that should make it easy. I've used a textured stitch, but you can use plain hdcs all the way if you prefer. I've also included edging instructions for both girls and boys so you have some variety, too.
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With worsted weight yarn and size I or J crochet hook,
Round 1: Ch 3, 11 hdc in 3rd ch from hook. (Skipped chs counts as first hdc.) Join with slst to first hdc. (12 hdc)
Round 2: Ch 2, hdc in same stitch, 2 hdc in each dc around. Join with slst to first hdc. (24 hdc)
Round 3: Ch 2, hdc in same stitch and in next 3 stitches, *2 hdc in next stitch, hdc in next 3 stitches. Repeat from * around. Join with slst to first hdc. (30 hdc)
Round 4: Ch 1, sc in same st, dc in next st. *Sc in next st, dc in next st. Repeat from * around. Join with slst to first sc. (30 sts)
Rounds 5-10: Slst in next dc, ch 1, sc in same dc, dc in next sc. *Sc in next dc, dc in next sc. Repeat from * around. Join with slst to first sc. (30 sts) Do not finish off.
Girl Edging: Ch 1, *sc in next stitch, ch 2, hdc in sc just made, skip next stitch. Repeat from * around. Join with slst to first sc. Finish off.
Boy Edging: Ch 1, *sc in next stitch to the right of hook (reverse sc made). Repeat from * around. Join with slst to first sc. Finish off.