I have Speckle Sussex chickens. One of them laid first egg unexpectedly at 14th Feb. Their birth is October 7th. So they are 16th weeks. To be honest, with my little knowledge , bunch of read, I was not expecting this early. Mid March , April...Maybe... It is small, half size of normal egg. And good healthy, solid shelf egg. 2 days later. Another same size of egg. (I think the same chicken, could not figure out which one yet). I was still on Grower feed as packages indicates for layer feed , I shall start at 18th week. Should I start layer feed and oyster shell? Of course, the one on the right is the first egg.