Chicken diaper sizes???

[kickinchicken]

I have 3 bantam cochins, a Sebright (bantam?) and a Bantam Sultan. I have looked at all the breed listings on BYC and cannot find a weight on these birds. For those of you who diaper, and these breeds in particular, what sizes should I be getting?

Thanks!

 

[drumstick diva]

some of the diaper sellers have a size chart or ask that you send in measurements from certain areas