Is there a way to know whether my polish is standard or bantam?

[Silkies~Polishes]

i have a black polish, and im not sure if she is bantam or standard. I got her from mypetchicken.com and im pretty sure they sell standard polishes on there but it doesnt exactly say. Is there a certain size/measurement range for the polish to know if its within bantam size requirements?
Thanks!

 

[Maveh]

Hi, I have a polish chick from the local plant nursery, I thought it was a bantam at first ----so small compared to other chicks in the enclosure. He or she was a "mystery chick" from the nursery's order of McMurray chicks.
The little polish was in a crowded pen of much larger leghorn chicks, but now that the chick doesn't have to fight for food, it's really putting on size fast. I wish I had the answer to your question, just wanted to share how my "little" one may be growing into a standard. The closest I can guess is that my chick is 5 weeks old.
Enjoy!