u can see in their hole in the behind if u roll it open a bit.... that the male will have one little pimple looking thingy and the girls will have 2 little pimple looking thingys together making a small slit.... worked for me to sex mine although I got 1 out of 22 wrong LOL
hi i have been putting newborn chicks straight from under the hen in with chicks that were born on the 16th of march... everyone gets along fine.... look at pics in New brooder pics of mine and you can see it will be alright....