I've noticed a very sour smell coming from the beaks of a couple of my 2 week old chicks. I've never experienced sour crop before because I am pretty new to the whole chicken thing so I don't know exactly what to do. Their crops are not big and do not feel full of stuff by are slightly squishy and feel basically empty. Their breath is horribly sour though. I believe they are all still eating and pooping so far. How do I help them?!