Silkies can be quite late to mature (perhaps as much as 8 or 9 months old). Because they take so long to develop it is very hard to know if your silkie chicks are cockerels or pullets, particularly if they are not from the same genetic line. Silkie cockerels tend to be bigger in size and the comb will usually develop sooner than on a pullet but the first more obvious sign is at around 4-6 months when their hackles start to develop ’streamers’. Even so it is often not 100% certain until they begin to crow or lay an egg!
A Silkie Rooster and Hen