Which organ(s) is/are actually larger in childhood, then shrink(s) when the person matures as a teenager?

Question

Quizplus · Accepted Answer

Lymph nodes are relatively larger in children and tend to shrink in size as the person matures into adolescence and adulthood. This is because children have a more active lymphatic system due to the constant exposure to new pathogens, which stimulates immune response and growth of lymphatic tissue.

Which Organ(s) Is/are Actually Larger in Childhood, Then Shrink(s) When