I don't know the specifics, but I have read that honey may result in infantile botulism in children 1 yr or less. I'm sure there is some research somewhere, but I make it a habit to advise people I sell honey to, not to feed it to infants. I think a four year old is way past any danger, but it's much easier to take the honey back, than risk any type of exposure. Along similar lines, I was amazed this year when the wives of several people I sold to called to ask about pastuerization of my honey. They were concerned that regardless of my stainless equipment, sterilization of my bottles etc, I did not have an FDA certificate ensureing the purity of my honey. I assured them there was nothing wrong with the honey, but for their peace of mind, I bought the honey back from them immediately. I told them they should stick with the cooked, store shelf stuff at the supermarket. And to look closely at the labels, because unheated, lightly filtered honey was now taking up half the space on the shelves. Don't get hoodwinked into eating the real thing.