My Baby Shows an Early Hand Preference
The short answer
True handedness - consistently preferring one hand over the other - should not develop until at least 18 months to 2 years of age, and often not until age 3-4. If your baby strongly favors one hand before 18 months, it may indicate that the other hand or arm is weaker or has decreased coordination, which is worth discussing with your pediatrician.
Parents everywhere have the same worry. You are doing the right thing by looking into it.
By Age
What to expect by age
0-6 months
Young babies naturally alternate between hands and should use both sides of their body equally. If you notice your baby consistently keeping one hand fisted while the other hand opens and grasps freely, this is an important observation to share with your pediatrician. It can sometimes indicate a difference in muscle tone between the two sides of the body.
6-12 months
Babies at this age should be reaching, grasping, and transferring objects with both hands, though you might notice a slight preference emerging. It's normal for a baby to use their right hand more often than their left (or vice versa), but they should still be capable of using both hands effectively. If one hand is clearly dominant and the other is rarely used, mention it to your doctor.
12-18 months
Some preference is emerging but your toddler should still use both hands for play, self-feeding, and exploration. If your child almost exclusively uses one hand and avoids using the other, or if the non-preferred hand seems weaker or clumsier, an evaluation is recommended. Early identification of asymmetry leads to better outcomes.
18+ months
True handedness can begin to emerge after 18 months and is completely normal. The key distinction is: does your child prefer one hand but CAN use the other effectively? If so, that's typical handedness developing. If one hand is significantly weaker or less coordinated, that's different and should be evaluated.
What Should You Do?
When to take action
- Your baby is over 18 months and uses one hand more often but can use both hands well - true handedness is starting to develop naturally.
- Your baby alternates which hand they prefer depending on the activity or which side an object is on.
- Your baby uses both hands together for activities like banging toys, holding a bottle, or clapping.
- Your child reaches with whichever hand is closer to the object rather than always crossing the body to use the same hand.
- Your baby under 12 months consistently reaches with only one hand and rarely uses the other.
- One of your baby's hands seems weaker or clumsier than the other.
- Your baby avoids using one hand during play even when objects are placed on that side.
- You notice that one hand seems tighter or more fisted than the other past 3-4 months of age.
- Your baby used to use both hands equally and has stopped using one - any loss of function requires prompt evaluation.
- One hand is consistently fisted while the other moves freely, especially after 4 months of age - this can indicate neurological differences that benefit from early therapy.
- Your baby has no use of one arm or hand and cannot grasp with it at all.
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
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 Only Army Crawls
Army crawling (also called commando crawling) is a completely valid and normal way for babies to move. Many babies army crawl for weeks or even months before transitioning to hands-and-knees crawling, and some skip hands-and-knees crawling entirely. What matters is that your baby is independently mobile and exploring their environment.
One Side of My Baby's Body Moves Differently
Babies should generally use both sides of their body equally. If one side consistently moves differently, is weaker, stiffer, or less coordinated, this warrants evaluation. Asymmetric movement can indicate hemiplegia (cerebral palsy affecting one side), brachial plexus injury, or other neurological conditions that benefit from early therapy.
My Baby Crawls Unevenly
While some variation in crawling patterns is normal, consistently favoring one side or dragging one limb while crawling warrants attention. Babies should use both arms and both legs relatively equally when crawling. Persistent asymmetry could indicate muscle tone differences, hip issues, or neurological concerns that benefit from early evaluation.
My Baby Still Has the Fencing Reflex (Persistent ATNR)
The asymmetric tonic neck reflex (ATNR, also called the fencing reflex) causes your baby to extend the arm on the side they are looking toward. It should integrate between 4-6 months. If the ATNR persists strongly beyond 6 months, it can interfere with bringing hands to midline, bilateral hand use, and rolling. Evaluation is recommended.
Signs of Ataxia in Babies and Toddlers
Ataxia refers to wobbly, uncoordinated movements that result from problems with the cerebellum (the brain's coordination center). Signs include an unsteady, wide-based gait, difficulty with precise hand movements, and intention tremor (shaking that worsens when reaching for something). If you notice these signs, evaluation by a pediatric neurologist is important.