Hi... you can try the following
Buy saline nasal spray. This is the only safe nasal spray to use with babies, infants, and toddlers. Lay the baby down on his back and, if possible, slightly tilt his head back (don't force it, though). Then spray 2 to 3 drops of saline spray into each nostril. Don't worry if baby sneezes some of it out -- it still made its way into the nasal passage. If any spray comes out of the nose, wipe it away gently with a tissue.
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Mama of 3!