When we found out we were expecting a baby (!), one of the first things I thought to make was a super squishy crocheted rug for the nursery. It needed to fit a few criteria: no holes so little fingers won't get caught and little toes won't trip, a flat circle, really soft and squishy for tummy time, and a cute border that also doesn't have any holes. I searched and searched, but I couldn't find the perfect pattern. So I decided to free-wheel it! This "pattern" is very flexible and can be changed up depending on how big you want your rug and how tight/loose you crochet, but this will give you the specifics on how I got my perfect rug and general guidelines on how you can make yours.
All you need to know are single crochet, slip stitch, and how to make a magic circle, and you'll be on your way!