advise on partridge bantams please

[goldenchic]

at what age will my bantams be full grown & when can i change there food to mash or pellets they're 14 weeks now but chick crumb doesn't seem to be satisfying them? they also have alot of treats

 

[SilkieTime]

Are you still using the starter or the grower? You can use the grower now. Are the getting thin? Chickens alway seem hungry.