I agree with JLeigh... let nature take it's course. Helping weak keets hatch (and adding those keets to your flock later on... or someone else's flock) often weakens the flock's gene pool, and usually produces breeding stock that can reproduce genetic deformities/abnormalities in most, if not all of their offspring. If keets are meant to hatch, they usually will... on their own. I don't mean to come across as harsh about this, just realistic. I've hatched thousands... so I'm speaking from lots of experience. I no longer help the keets that struggle, due to consequential issues down the road.