Paranasal sinuses present at birth are
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.
Frontal and maxillary
Ethmoid and maxillary
Frontal and ethmoid
Sphenoid and ethmoid