I have 3 young chickens, my first egg came on aug 16th, by the end of the day, there were a total of 3 eggs laid. Since that day, we are only getting one egg a day. We started with one nesting box, as I read that they tend to use the same one. We just added a box for each hen, hoping that that would change things, and on day two, has not. Why would they all seem to lay an egg on the first day, but not continue that pace?