That is very strange. Sensation to the lower gum is from the mandibular 
branch of the trigeminal nerve and tongue lateralization is controlled 
by the hypoglossal nerve. The trigeminal nerve fibers in the principal 
(main) sensory nucleus cross to the contralateral side of the brain (for 
all fibers EXCEPT the ones that provide sensation inside the mouth. 
Perhaps in this baby they all crossed?

I hope you can continue to follow this infant.

Catherine Watson Genna BS, IBCLC  NYC  www.cwgenna.com

On 7/14/2014 2:19 PM, Laura Spitzfaden wrote:
  The most unusual finding was that while Baby can lateralize her tongue 
evenly, from side-to-side, she does so to the opposite side of gum 
stimulation. When I trace a finger to the right side of her gums, she 
lateralizes to the left and vice versa. Has anyone encountered this with 
another infant and what is the significance?

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