Hello amckean Well it is normal for the bottom leaves to die off, but without seeing there size it's a bit difficult to tell

If you can post a pic that would be good , just watchout for any of the leaves above them dying if they do then there might be a problem.
But try not to worry too much like I said it's normal for the bottom leaves to die

Check out JPG's thread, he asked a similar question

http://boards.cannabis.com/showthread.php?t=38743


love mand xxx