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4-Month-Old Baby’s Arm Shaking – A Neuro Problem?

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by Issac

Our 4 1/2 month old son’s arms start to shake when he is attempting to grab something and can’t get his grip on or when getting annoyed or sleepy and about to cry. It appears it’s mainly when these things are happening around him that this begins.

When we hold his hands, the shaking stops but when you let go, it picks right back up again. The best way to describe it would be as if someone was super excited or nervous that their arms would be shaking in that way.

We don’t know if this is just a part of growing up or something a bit more serious. These happen throughout the day and other times he holds his hands nice and straight.

Is it any kind of neuro problems?? Would appreciate any input!

Thank you!

Baby Help Line:

Baby Shaking – What’s Normal And Not

What you describe is probably normal shaking due to your baby’s immature nervous system. I remember believing that my first born suffered from some kind of brain damage when she was newborn due to her weird movements and shaking… But it turned out to be completely normal newborn movements.

A brief and involuntary twitching of a muscle or a group of muscles is called myoclonus. Myoclonus can occur episodically through life as hiccups or hypnic jerk (spasms that occurs while falling asleep). However, myoclonus can also happen due to a number of neurological disorders.

In children it is important to distinguish myoclonus from other movement disorders or seizures that might need a specific treatment.

When myoclonus occurs in otherwise normal babies, the health condition is called benign myoclonus of early infancy or Fejerman syndrome. The onset of this health condition is between 3 and 15 months. Affected children usually have normal psychomotor development prior and after the onset of the first episode and do not show other neurological symptoms. Abnormal movements often occur while awake or during light sleep and might be triggered by frustration, anger, fear and excitement.

Benign myoclonus of early infancy does not require treatment and has a favourable long-term outcome. Of course your doctor has to make the appropriate studies in order to rule out other neurological disorders.

Nevertheless, it is important to distinguish seizures from movement disorders. Some of the warnings signs to look for are the following:

  • The abnormal movements are associated with eye movements.
  • The shaking is not associated to any stimulus. Generally, physiological myoclonus is stimulus-sensitive and may be initiated or stopped by noise or sudden movements.
  • The shaking occurs at any time. If it is is only when changing diapers, feeding, getting angry etc, is is not likely to be for example a seizure.
  • The shaking continues even if you hold the arm.
  • Shaking that is bilateral is more likely to be a sign of problems
  • The babys is falling behind on developmental milestones

From what you describe, your baby doesn’t seem to have these problems. Still, if it was me I would probably take him to a pediatrician anyway, just to be on the safe side and also to get rid of the worrying.

I hope this helps,

(Answer approved by our Medical Doctors Reference Team)

More Babies With Shaking And Seizure Issues

Find comments below.



Sep 14, 2013

3m old baby shakes her leg
by: Anonymous

My 3 months old baby shake her legs when she touch objects. We took her to the dr; she did a blood test and ultrasound. It was all normal but I’m still worried. She is been doing it since from 2 weeks old.

Her Dr think it’s just a immature nervous system and she will get better.

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