My trends exposed

I was able to pull some of the data together that has been collecting in my SLBuzz traffic meter. I created a spreadsheet in excel and created a chart. I was surprised, and not surprised. A giant hump starting in september 2006 peaked at February/March, and then sunk down drastically until July. I pulled at more data to look at the age range of people and found that people less than 1 month old were my primary source of visiters. There was a sharp drop-dead decline at the end of April. What happened?