<prompt> Paranasal sinuses present at birth areFrontal and maxillaryEthmoid and maxillaryFrontal and ethmoidSphenoid and ethmoid  <response>: Paranasal sinuses develop as outpouchings from the mucous membrane of a lateral wall of the nose. The growth of sinuses continues during childhood and into early adult life.Radiologically maxillary sinuses can be identified at 4-5 months, ethmoids at 1 year, sphenoid at 4 years and frontals at 6 years. 