We lost a baby

I worked a half day today and came home to find the blue collared boy had died.  I am not sure how he died.  When they are this young its difficult.  He had been gaining weight well and was healthy, so his mama may have laid on him or accidently stepped on him wrong.  I couldn't find any signs of a problem.  I wish I had been here, but I am not sure if it would have done any good.  They are so precious.