There may be a legitimate reason for this downward movement, but I don't know what it is. For all I know, some short-term and technical traders are just selling from the downward movement yesterday. Perhaps an insider is taking this opportunity to diversify his portfolio, or a few funds are taking profits, and a bit of momentum got kicked up from that movement.
As a longer-term investor, I'm not going to worry about it. I just took this opportunity to add some more BABY to my portfolio as well. (What can I say? I like it when things are on sale. :)