This may occur due to misfiring of signals sent by the nervous system in babies that have not fully developed and matured yet. Tremors or shaking of the body parts, such as the jaws, hands, or legs, are some of the common symptoms. The symptoms of this condition include shaking, tremors, jerks, and quivers that may not limit themselves to the lip. However, most cases end up being a result of the nervous system struggling to keep up with development. Underdeveloped nervous systemīirth-related defects that affect only the lip are rare, but they do happen. So, let’s take a look at the reasons why this behavior occurs before looking at how it is diagnosed should you wish to seek medical assistance. If your baby’s lip quivers continuously, there could very well be a medical reason behind it. Such quivering exists primarily when a baby is irritated or hungry or when a baby is moved suddenly from a cold room into a warm room or vice versa. The tremors continue for a few seconds, then stop. Then they spread to the upper arms, and finally they spread to the neck, face, and lips. The tremors then spread to the thighs, hips, stomach, and chest. The tremors are often rhythmic, beginning in the legs and flowing into the knees and then up to the feet and down to the toes. The tremors occur in well-defined patterns. There are several signs and symptoms to look out for when this happens. Newborn babies who display the signs and symptoms of lip quiver or lower jaw trembling are often accompanied by a few other signs and symptoms. The baby might only cry for a few seconds before their lips start shaking, and only a minority continues this behavior well into adulthood. For example, it may be difficult for them to control their lip muscles. However, it often stops by the time that the child is 6 months old.īabies have an immature nervous system, and until it is more fully developed, some of their muscles may not work as well as others. This can be caused by anything from being cold to being hungry, or even being tired. Sometimes when a baby cries, the lips of the child begin to shiver. Please read my disclosure policy for more information. As an Amazon Associate, I earn from qualifying purchases. The links below may be affiliate links.
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