Is it normal for newborns to shake?

Why This Happens

Newborns are born with a nervous system that is still “under construction.” The signals between the brain and the muscles aren’t always smooth, which can lead to visible shaking. Here are a few common reasons why this occurs:

• Immature Nervous System: The myelin sheath (the protective coating around nerves) is not fully developed, which can cause electrical signals to jump or fire inconsistently, resulting in a tremor.
• Startle Reflex (Moro Reflex): Newborns often shake or throw their arms out in response to a loud noise, a sudden movement, or the feeling of falling.
• Temperature Regulation: Because babies cannot regulate their body temperature as well as adults, they may shake slightly if they are chilly.
• Excitement or Hunger: Some infants may exhibit “jitteriness” when they are overstimulated, very hungry, or crying intensely.

What It Might Mean in Your Situation

To understand if the shaking is a typical part of development or something that requires a professional look, it is helpful to observe the pattern and timing of the movements. Consider the following factors:

The “Touch Test”: One of the most important distinctions is whether the shaking stops when you gently touch or hold the shaking limb. Normal newborn jitters usually stop immediately when the limb is supported. If the shaking continues despite your touch, it may be a different type of movement.

The Context: Does the shaking happen only during feeding? Only during sleep? Or only when the baby is startled? Identifying the trigger can help you provide a clearer description to a healthcare provider.

Associated Symptoms: Pay attention to the baby’s eyes and overall responsiveness. Normal tremors usually don’t affect the baby’s awareness. If the shaking is accompanied by rhythmic eye movements, staring spells, or a change in skin color (such as turning blue around the lips), this is a different clinical picture.

What To Do About It

1. Observe and Document: When you notice the shaking, try to record a short video of it on your phone. This is the most practical way to show a pediatrician exactly what is happening, as babies rarely shake during the actual appointment.
2. Provide Comfort and Warmth: If the baby seems startled or cold, try swaddling them snugly or offering skin-to-skin contact. This often calms the nervous system and reduces the frequency of tremors.
3. Consult Your Pediatrician: Schedule a non-emergency call or visit to describe the movements. Use specific wording: “I noticed my baby’s arms shake when they are excited, and it stops when I hold them. Is this typical for their age?”

Real-Life Example

Sarah noticed her two-week-old son’s legs shaking whenever he was lying on his back and getting excited about a toy. She felt concerned that it looked like a seizure. However, she noticed that as soon as she placed her hand on his thigh, the shaking stopped instantly. Sarah recorded a 10-second clip of the movement and sent it to her pediatrician, who confirmed it was a normal part of his developing nervous system. Sarah felt relieved and continued to monitor his growth.

Related Questions

• Is the newborn startle reflex normal?
• Why does my baby shake during sleep?
• How to tell the difference between a seizure and newborn jitters?
• What are signs of poor muscle tone in newborns?

When To Seek Outside Help

Because this involves an infant, medical guidance is essential. You should contact a qualified healthcare provider or emergency services immediately if the shaking is accompanied by: stiffness, rhythmic eye blinking or rolling, apnea (pausing breath), a fever, or if the shaking cannot be stopped by gently holding the limb. If you are experiencing severe anxiety or distress regarding your baby’s health that interferes with your ability to care for them, please reach out to a licensed counselor or a postpartum support professional.