There is a range of crest sizes on the Cream Legbar. Some have to do with modifiers genes that effect the crest size and some have to do with birds that are missing one (or both) cresting genes. For the best cresting you require the bird to be pure breed for cresting (i.e. they inherit a cresting gene from both parent). The well crested chicks have a poof on their head that is visible as day old chicks. If they have the modifiers for smaller crests or they are missing one cresting gene there may be no poof at day-old but as soon as they start to feather out the crest should be visible. IF they have tail feathers and wing feather the cresting should be coming in.