My neighbor got 3 red sex link chicks at the same time I got mine. They are 14 weeks tomorrow. He came over today and mentioned that one of his is only about half as big as the others and has a very large squishy crop. I guessed it was sour crop but had no idea if that would stunt its' growth. He didn't mention how long her crop has been like that. I suggested yoghurt but see that apple cider vinegar is recommended by other BYC members. Does anyone know if slow growth is connected to sour crop or is something else wrong? He's more likely to cull her than get into expensive treatments. He said he would try the yoghurt though.