Ok so I shouldn't be worried I know they've grown tremendously in the last week ....they are still chirping no quacks yet any idea what age they star quaking I would love to officially name them but have no idea what sex they are I have 5 my daughter named the darkest Ella because she was the littlest when we got them now she's the 2nd biggest and I named mutt big one weeble because when they had their niacin deficiency he would wobble a little when he (it) walked so I call it weebles wobbles but he won't fall down lol