The bunny is knit from DK weight yarn, and the nappy and blanket are knit from fingering weight yarn.
This pattern is available in Festive Knits, and also available from Ravlery with the Mama Bunny pattern (that is, the Mama Bunny pattern also includes the instructions for the Baby Bunny).
ERRATA A small mistake in the nappy pattern. The third to last row of instructions reads:
Next: k2, m1, k to last 4 sts, m1, k2.
It should read:
Next: k2, m1, k to last 2 sts, m1, k2.