Start with a magic ring.
R1: work 8 sc in the round. 1 ss and 1 ch.
R2: ( 2 sc in next st) * 8 times. 1 ss and 1 ch.
R3: ( 1 sc, 2 sc in next st) * 8 times. 1 ss and 1 ch.
R4: ( 2 sc, 2 sc in next st) * 8 times. 1 ss and 1 ch.
R5: ( 3 sc, 2 sc in next st) * 8 times. 1 ss and 1 ch.
R6: ( 4 sc, 2 sc in next st) * 8 times. 1 ss and 1 ch.
R7-15: make 48 sc in each round. 1 ss and 1 ch.
R16: ( 2 sc, sc2tog,2 sc) * 8 times. 1 ss and 1 ch.
R17: ( 3 sc, sc2tog) * 8 times. 1 ss and 1 ch.
R18: ( 1 sc, sc2tog, 1sc) * 8 times. 1 ss and 1 ch.
R19: ( 1 sc, sc2tog) * 8 times. 1 ss and 1 ch. Add stuffing cotton
R20: (sc2tog) * 8 times. 1 ss in the first st. Cut off the tail and weave the end.
Use the yellow yarn to sew 6 lines around the ball you just made and pull them tight to form a pumpkin shape.