I have learned a valuable lesson today.
There is a reason for swim diapers. After spending three days in a row at the beach, with sandy board shorts rubbing against sensitive boy parts for hours on end, today he experienced some major irritation. Poor baby spent the last two hours at the beach sitting naked in my lap and whimpering, holding his sore boto.
There was no way I could have known this - I grew up with two sisters! Tomorrow we are wearing a swim diaper.