Amigurumi needs to be crocheted tightly so stuffing does not show through stitches. You can use any yarn weight and appropriate hook to create this pattern. Changing yarn weight and hook will affect the size of your finished piece.
Safety eyes are considered a choking hazard. If you intend on giving this doll to a child under 3 years old, it is highly suggested you use yarn eyes in place of the plastic safety eyes.