Adenoids develop from a subepithelial infiltration of lymphocytes after the 16th week of embryonic life.
After birth, enlargement begins and continues until aged 5 to 7 years. Symptomatic enlargement between 18-24 months of age is not uncommon meaning that snoring, nasal airway obstruction and obstructed breathing may occur during sleep.
The establishment of the upper respiratory tract is initiated at birth.
Species of bacteria such as lactobacilli anaerobic streptococci, actinomycosis, Fusobacterium species and Nocardia are normally present by 6 months of age. Normal flora found in the adenoids consists of alpha-hemolytic streptococci and entercocci.
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*image credit to Structure & Development Of Adenoid