During a routine checkup, a nurse observes that a 4-year-old child has noticeably enlarged tonsils but is otherwise healthy with no signs of infection. The child's parents express concern. Which statement BEST explains this finding?

Lymphoid tissue, including tonsils, normally enlarges in early childhood and may exceed adult size before gradually shrinking in adolescence.

This finding is abnormal and warrants an urgent referral to an ENT specialist.

The enlarged tonsils suggest the child's immune system is underdeveloped.

The enlarged tonsils indicate a chronic infection that requires immediate antibiotic treatment.