I know for mine, after the solar eclipse (which was total for a few minutes in my area), and especially after the solar flares, mine have decreased in production as well. A relation, who is on Facebook while I am not, says that a lot of people have had egg production declination after the solar...
Hello, and welcome to BYC, @Krosfyre9838! I just hatched last weekend, and one of my chicks had a bellybutton just like that. I left it, and it absorbed completely by itself; I can no longer tell it from the others, try as I might. I hope this helps you!