My Baby Prefers One Hand Too Early
The short answer
True hand preference should not develop until at least 18 months to 2 years of age. If your baby consistently uses only one hand and ignores or avoids using the other before 18 months, it may indicate that the less-used hand or arm has reduced strength or coordination. This is different from a slight preference and 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
0-5 months
At this age, babies should use both hands fairly equally, though movements are still developing and may look uncoordinated. Watch for whether your baby opens both hands from a fisted position, bats at objects with both hands, and brings both hands to their mouth. If one hand remains tightly fisted while the other opens freely, or if your baby only reaches and bats with one arm, this is a significant observation to share with your pediatrician.
6-9 months
Babies should be actively reaching, grasping, and transferring objects between both hands. It is normal for a baby to sometimes prefer one hand for a particular task, but they should be capable and willing to use both. If your baby consistently avoids using one hand, always reaches across their body to use the preferred hand, or one hand seems much weaker or clumsier, evaluation is recommended.
9-14 months
Babies are refining their fine motor skills, developing the pincer grasp, and using their hands for self-feeding and play. A slight hand preference may emerge and is normal, but the key question is whether your baby can effectively use both hands. If one hand is clearly weaker, if your baby avoids using it even when objects are placed on that side, or if one hand moves differently than the other, discuss this with your pediatrician.
15-18 months
A mild hand preference is becoming more acceptable at this age, as true handedness can begin to emerge after 18 months. However, one hand should not be dramatically dominant over the other. Your child should still use both hands for activities like stacking blocks, holding food, and clapping. If one hand is clearly the "strong" hand and the other seems to just assist or is avoided, an occupational therapy evaluation may be beneficial.
What Should You Do?
When to take action
- Your baby uses one hand slightly more often but can and does use both hands effectively for grasping and play.
- Your toddler over 18 months is developing a natural hand preference but can still use both hands well.
- Your baby alternates which hand they prefer depending on which side the object is on.
- Your baby uses both hands together for activities like clapping, holding a bottle, and banging toys.
- Your baby under 12 months strongly favors one hand and rarely uses the other for reaching or grasping.
- One hand seems weaker or less coordinated, dropping objects more or having difficulty grasping.
- Your baby avoids using one hand even when you deliberately place toys on that side.
- Your baby previously used both hands equally and has stopped using one hand, as loss of function requires urgent evaluation.
- One hand is consistently fisted and cannot open to grasp while the other hand works normally, particularly after 4 months of age.
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.