Loopy Love Hat
The Loopy Love Hat uses the same stitches as the Loopy Love Blanket, but working in the round without turning - this creates a lovely swirling effect! If you prefer a more exact match then you can turn after joining every round. After making the baby size blanket I had more than enough to make the baby/toddler size hat (though it was cutting it close on the color I used for the blanket edging). So there should be enough left over to make the smaller newborn size hat as well.
You might be able to squeak out the child size with the leftovers too, as long as you use the blanket edging color as the least used color in the hat. If you’ve got the yardage to spare and prefer a slouchier hat, just add more rows in the section where you’re working evenly!