My kids brought home 2 pekins from TSC when the pekins were 3 days old. 5 days later I got my shipment of ducklings in that were about 3 days old, so the 2 pekins I already had are about 5 days older. The 2 I had are gigantic next to the other pekins and much heavier with fuller breasts and long bodies. Is it possible I ended up with jumbo pekins or is it fairly normal that they are so much bigger being almost a week older?