How big are silkie chickens? September 14, 2017 Amber Waves Silkies in this country are Bantams. According to the American Silkie Bantam Club, the birds should weigh as follows: Feather Legged Bantams – Weights: Cock 36 oz. Cockerel 32 oz. Hen 32 oz. Pullet 28 oz. Check out the SOP for the breed here: http://www.americansilkiebantamclub.org/standard.asp Silkie Chickens