My Baby Has Jerky Movements
The short answer
Newborns and young babies often have jerky, uncoordinated movements because their nervous systems are still developing. What looks like random flailing is actually your baby learning how their body works. These movements typically become smoother and more controlled by 3-4 months as motor skills mature.
By Age
What to expect by age
Jerky, almost spastic movements are completely normal at this age. Your baby's nervous system is immature, and they haven't yet learned to control their muscles smoothly. You might see their arms and legs shoot out suddenly, or their whole body make a big jerking motion, especially when they're startled or during sleep transitions. This is typical newborn behavior and will smooth out as their brain develops.
By this age, you should start to see movements become more purposeful and less jerky. Your baby is learning to reach for things, bring hands to mouth, and control their head and neck smoothly. Some jerkiness is still normal, especially when they're excited or trying something new. If movements are becoming smoother overall, things are progressing well.
Most movements should be fairly smooth and coordinated by now, though your baby might still have some jerky motions when they're tired, excited, or concentrating hard on a new skill. If your baby's movements seem as jerky and uncontrolled as they were at birth, or if one side of the body moves very differently from the other, talk to your pediatrician.
By this age, jerky movements should be rare. Your baby's movements might still be clumsy (that's normal as they learn to walk and manipulate objects), but they shouldn't look spastic or uncontrolled. Persistent jerky movements at this age warrant an evaluation to make sure everything is developing as it should.
What Should You Do?
When to take action
- Your baby is under 3 months and has jerky arm and leg movements, especially when excited, crying, or falling asleep.
- The jerky movements are equal on both sides of the body.
- Your baby is becoming more coordinated over time - even if they're still a bit jerky, you can see progress.
- Your baby can be soothed when movements happen and doesn't seem scared or in pain.
- Movements happen during wake times and sleep transitions but your baby can also have periods of calm, smooth movement.
- Your baby is over 6 months and movements still seem very jerky or spastic most of the time.
- One side of your baby's body moves much more jerkily than the other, or one limb seems particularly stiff or floppy.
- Jerky movements seem to be getting worse instead of better as your baby gets older.
- Jerky movements are rhythmic (same motion over and over), last more than a few seconds, and your baby can't be interrupted or soothed - this could be a seizure.
- Your baby's body goes stiff, their eyes roll back, or they lose consciousness during jerky episodes.
- Jerky movements started suddenly and are accompanied by fever, vomiting, or your baby seems very unwell.
Sources
Related Resources
Related Physical Concerns
My Baby Seems to Use One Side More Than the Other
Babies should use both sides of their body fairly equally during the first 18 months of life. While slight preferences can be normal, a consistent pattern of favoring one side - using one arm much more than the other, crawling with one leg dragging, or turning the head predominantly one way - should always be discussed with your pediatrician. Early identification of asymmetry leads to the best outcomes.
My Baby Curls Their Toes
Toe curling is very common in babies and is usually caused by the plantar grasp reflex, which is a normal newborn reflex that causes toes to curl when the sole of the foot is touched. This reflex typically fades by 9-12 months. Occasional toe curling during standing or walking is also normal as babies figure out their balance. Persistent, tight toe curling past 12 months may warrant a mention to your pediatrician.
My Baby Favors One Leg
Babies should use both legs roughly equally when kicking, crawling, and eventually walking. If your baby consistently favors one leg or seems to avoid using the other, it is worth having your pediatrician take a look. The cause is often something simple and treatable, like a minor hip or muscle issue, but early evaluation helps ensure the best outcome.
My Baby Gets Hiccups a Lot
Hiccups are extremely common in babies, especially newborns, and are almost always completely harmless. They happen because your baby's diaphragm is still developing and gets a little jumpy when their tiny stomach fills up or air gets swallowed. Most babies outgrow frequent hiccupping by 6-9 months.
Baby Not Bearing Weight on Arms
Bearing weight on the arms is a gradual skill that develops during the first 6 months. Babies first prop up on their forearms around 2 to 4 months, then progress to pushing up on extended arms by 5 to 6 months. Regular tummy time is the best way to build this strength, even if your baby protests at first.
Baby Not Bringing Hands to Midline
Bringing hands to midline - the center of the body - is an important early motor milestone that typically develops between 3 and 4 months. Before this, babies tend to keep their hands to their sides or near their face. Once midline play develops, you will see your baby clasping their hands together, reaching for toys with both hands, and bringing objects to their mouth. This skill lays the foundation for many later abilities like transferring objects between hands and self-feeding.