What is a sitter session? A sitter session is a session between the ages of 6-7 months old. This is usually the time when the child can safely sit on their own. It is my second favorite session. Usually, the child is content sitting and being the center of attention. Adalyn did not disappoint. She was like a living baby doll. She smiled and laughed and had amazing eye contact with me. It was a very fun session and I hope mom and dad cherish these beautiful images of their beautiful little girl!