Is the baby's entire body shaking, or is it just the tongue and jaw?  
When babies have low muscle tone or a tongue tie, they can have fatigue 
tremors (enhanced physiologic tremors due to muscle fatigue from the 
excessive work they need to put into feeding.) of the mouth, usually the 
tongue and lower jaw.
If it's the whole body, or the baby's limbs, baby should be examined by 
a physician, preferably a neurologist. Shaking can be tremors, seizures, 
etc.
Catherine Watson Genna, IBCLC  NYC

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