They withdraw from adults.
Second graders are immersed in their social life at school. They are striving to be independent, which means they want to rely less on adults. They often complain that teachers and other adults are mean or treat them unfairly.
What you should do: Don’t panic. This is an important part of your child’s development. If he doesn’t want to hug and kiss when you say goodbye, play it cool. Second graders are especially sensitive to being embarrassed in front of their friends.