I guess I'm not growed up

My mom called and Davis always wants to talk his grandparents, so I passed the phone on to him. After talking to her for a few minutes, he asked if he could talk to Papa. She told him that he wasn't with her. "Oh," he said, "Are you at work?" My mom told him she was and he responded, "We're not at work. Cause I'm not growed up yet. But I'm growing up."