Hello, first time on mumsnet, and in need of advice please. DS 4 years old in Reception, when I collected him from school today I was pulled aside by teacher and told that he had pulled his pants down and shown his willy to a girl in his class, it transpires she asked to see it and he obliged and she laughed! He got sent to the Headmistress, I got a stern talking too, and I'm mortified, is this something that little ones can do, school have made me feel like he is very weird! Help please!