My 2 youngest chicks are 14 weeks. The rest of the flock is 17-21 weeks of age. I'm almost out of starter(grower is not available) and I have a bag of layer sitting in my basement unopened that dh bought 1-2 months ago jumping the gun on their feed. Is it too soon to switch to layer or should we head out to the store tonight for a bag of starter for one more month? Will layer cause kidney damage in 14 week old chicks? Thanks.