With A, ch 2.
Rnd 1: Work 6 sc in 2nd ch from hook. Place marker in first st for beg of rnd; move marker up as each rnd is completed.
Rnd 2: Work 2 sc in each st around - 12 sts at the end of this rnd.
Rnd 3: *2 sc in next st, sc in next st; rep from * around - 18 sts.
With B, ch 2.
Rnd 1: Work 4 sc in first ch. Place marker for beg of rnd; move marker up as each rnd is completed.
Rnd 2: Work 2 sc in each sc around - 8 sts at the end of this rnd.
Stuff with a small amound of fiberfill.
Rnd 3: Sc2tog around - 4 sts.
Weave in ends.
With sewing needle and thread, sew Bobble to Disc. From felt, cut a circle slightly smaller than Disc. Sew felt to back of Disc. Sew pin back to felt.