I have 12 baby cochins. They're 15 days old today! 5 of them come to me at will and enjoy being petted and held. 4 of them stand off to the side and eye me suspiciously, but do like treats. 3 of them refuse to come near me and actually scream in terror if I move my hands toward them. They won't even come to me for treats. They back themselves into a corner of the brooder and scream at me! These 3 I haven't held much in the 15 days I've had them because they fly in panic when I try to touch them. What can I do?? Will they always be like this?