As you have surely heard, we have started our Human Growth and Reproduction unit. We are talking about the male and female reproductive systems. Your son had a great question in today's lesson that falls outside of our learning targets for fourth grade. I suggested he talk to Mom or Dad. The question was about how does a girl get a sperm? This was after explaining that the sperm fertilizes an egg.
I wanted to give you a heads up about your son's question. Not a bad question, but not what we teach in fourth grade. :)