In her book "Love, Rosie," Cecelia Ahern emphasizes the importance of friendship in a child's development. Close friends play a crucial role in helping children explore their identities and learn about the world around them. Through these relationships, they can discover new things about themselves, which is essential for personal growth.

Moreover, the author highlights that friends also provide emotional support, helping children navigate the challenges of life. They are vital for maintaining mental well-being, offering companionship and understanding that can help keep young ones grounded and sane as they grow up.