We are new to raising chickens & we purchased 2 Rhode Island Reds and 2 Ameraucanas from a local feed store. How can I tell the gender or is it too early? I am specifically curious about the one pictured here. She (hopefully) is so calm and timid, that we have started calling her Sweetie. They are all a little over 3 weeks old. Let me know if anyone has any tips or guesses! Sweetie is the speckled one in the middle.