Is it a coincidence?

A few days ago a statistician on TV stated that 29% of mothers are stay-at-home moms, which is up from previous years.  He pointed to the difficulty in finding well paying jobs and the cost of day care as possible factors.  My first thought was that that might be a good thing.  I was a stay-at-home mom for a relatively few years but I have some treasured memories from that time.  However, today another report stated that the number of "very obese" children has increased dramatically in the last few years.  So now I have to wonder, are those stay-at-home moms baking too many cookies?