One of my new chickens (hatched in April) just laid an egg. It is very small (1/4 the size of a normal egg). At first, I thought it was a bird's egg (fallen from a nest)...but it is far too big for that. And yet, my chickens are too young to start laying. I am integrating the new girls with my existing. Of course, my new girls are on Start and Grow but I do see them nibbling on Layer feed when they are out of the coop. Could this be the reason for such precocious egg laying?