Hi We hatched two indian runner duck eggs. One egg was at least 50% bigger than the other. This one hatched first, the second two days later. Big duck (Spongebob) has always been much bigger and more active than little duck (Squarepants). After two weeks little duck seems to be struggling, he only weighs 70g vs. 250g for big duck. He makes much less noise and is less enthusiastic about feeding. Today he appears very docile and not that keen on eating. Big duck is an eating machine, little duck appears to be struggling. We feed them chick crumb, grated cucumber, grated melon, catfood and small slugs. What can we do to help little duck? He is happy grazing in the garden and loves slugs, but just appears very docile today and nothing like as active as the big one.