Early Hand Preference in Newborns (Using One Hand Only)
Medically reviewed by Dr. Sarah Chen, MD, FAAP · Board-Certified Pediatrician
Content reviewed against published AAP, CDC guidelines
Last reviewed:
Your baby's physical development is unique, and concerns about early hand preference in newborns (using one hand only), here is what you need to know.
The short answer
Babies should not show a strong hand preference before 12-18 months of age. If your newborn or young infant consistently uses one hand much more than the other, or seems to ignore one hand, it could indicate a neurological concern or birth injury that should be evaluated by your pediatrician. True handedness normally develops between 2-4 years of age.
Key takeaways
- Babies should not show a strong hand preference before 12-18 months of age. If your newborn or young infant consistently uses one hand much more than the other, or seems to ignore one hand, it could indicate a neurological concern or birth injury that should be evaluated by your pediatrician. True handedness normally develops between 2-4 years of age.
- Usually normal when: Baby uses both hands roughly equally for reaching and grasping
- Call your doctor if: Your newborn does not move one arm at all, which could indicate a birth injury requiring prompt evaluation
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, CDC guidelines, babies should not show a strong hand preference before 12-18 months of age. If your newborn or young infant consistently uses one hand much more than the other, or seems to ignore one hand, it could indicate a neurological concern or birth injury that should be evaluated by your pediatrician. True handedness normally develops between 2-4 years of age. At 0-1 month, at this age, hand movements are largely reflexive, and babies should move both arms and hands roughly equally. If you notice that your newborn consistently does not move one arm or hand, or holds one arm differently, this could be a sign of a birth injury such as brachial plexus injury (Erb's palsy) or clavicle fracture. Report any asymmetry in arm or hand movement to your pediatrician promptly. It is generally considered normal when baby uses both hands roughly equally for reaching and grasping. However, you should contact your pediatrician promptly if your newborn does not move one arm at all, which could indicate a birth injury requiring prompt evaluation.
Normal vs. Concerning
By Age
What to expect by age
0-1 month
At this age, hand movements are largely reflexive, and babies should move both arms and hands roughly equally. If you notice that your newborn consistently does not move one arm or hand, or holds one arm differently, this could be a sign of a birth injury such as brachial plexus injury (Erb's palsy) or clavicle fracture. Report any asymmetry in arm or hand movement to your pediatrician promptly.
1-3 months
As your baby begins to have more purposeful hand movements, both hands should be used similarly. Babies at this age should be opening and closing both hands and bringing them to the mouth. If one hand remains fisted while the other opens freely, or if your baby consistently reaches with only one hand, mention this to your pediatrician.
3-6 months
Babies should be reaching for and grasping objects with both hands. They should transfer toys from one hand to the other by about 6 months. Persistent preference for one hand at this age could indicate hemiplegia (weakness on one side) or another neurological condition that benefits from early intervention.
6-12 months
Both hands should be actively used for exploring, banging, and manipulating objects. While some babies may show a slight preference, strong one-handed dominance before 12 months is atypical and should be evaluated. Early identification of one-sided weakness allows for therapy that can significantly improve outcomes.
What to Tell Your Pediatrician
- Describe when you first noticed early hand preference in newborns (using one hand only) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if consistent use of one hand while ignoring the other.
- Mention if one hand remains fisted while the other opens freely.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Baby uses both hands roughly equally for reaching and grasping
- Slight preference that varies from day to day
- Both hands open and close freely and have similar movement range
- Baby transfers objects between hands by 6-7 months
- Consistent use of one hand while ignoring the other
- One hand remains fisted while the other opens freely
- Baby does not reach with both hands by 4-5 months
- Your newborn does not move one arm at all, which could indicate a birth injury requiring prompt evaluation
- Strong early hand preference combined with stiffness or floppiness on one side of the body, which could indicate a neurological condition
What You Can Do at Home
- Keep track of when you notice early hand preference in newborns (using one hand only) — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that baby uses both hands roughly equally for reaching and grasping — this is generally within the range of normal.
- At 0-1 month, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Provide plenty of supervised floor time and tummy time to support your baby's physical development.
- While monitoring at home, seek immediate care if your newborn does not move one arm at all, which could indicate a birth injury requiring prompt evaluation.
Related Conditions
My Baby Prefers One Hand Too Early
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.
Erb's Palsy (Brachial Plexus Birth Injury)
A brachial plexus injury (Erb's palsy) occurs when the nerves controlling the arm are stretched during delivery, most often during shoulder dystocia. The affected arm may appear limp or have limited movement. The good news is that 80-90% of cases resolve within the first 3-6 months with conservative management and physical therapy.
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.
Related Resources
Milestone Checklists by Age
Track your baby's developmental milestones from birth to 5 years with age-specific checklists.
Month-by-Month Development
Detailed monthly development guides from birth through 24 months.
When to Call the Doctor
General guide on when to call the pediatrician, visit urgent care, or go to the ER.
Frequently asked questions
Is early hand preference in newborns (using one hand only) normal?
When should I call the doctor about early hand preference in newborns (using one hand only)?
When is early hand preference in newborns (using one hand only) normal?
What causes early hand preference in newborns (using one hand only)?
What should I mention to my pediatrician about early hand preference in newborns (using one hand only)?
Is early hand preference in newborns (using one hand only) normal at 0-1 month?
Is early hand preference in newborns (using one hand only) normal at 1-3 months?
Should I go to the ER for early hand preference in newborns (using one hand only)?
Does early hand preference in newborns (using one hand only) go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Early Hand Preference in Newborns (Using One Hand Only).
Things to mention
- Describe when you first noticed early hand preference in newborns (using one hand only) and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if consistent use of one hand while ignoring the other.
- Mention if one hand remains fisted while the other opens freely.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Consistent use of one hand while ignoring the other
- One hand remains fisted while the other opens freely
- Baby does not reach with both hands by 4-5 months
Urgent signs to report immediately
- Your newborn does not move one arm at all, which could indicate a birth injury requiring prompt evaluation
- Strong early hand preference combined with stiffness or floppiness on one side of the body, which could indicate a neurological condition
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of early hand preference in newborns (using one hand only) are normal. Talk to your pediatrician if your newborn does not move one arm at all, which could indicate a birth injury requiring prompt evaluation.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Physical Concerns
My Baby Prefers One Hand Too Early
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.
Erb's Palsy (Brachial Plexus Birth Injury)
A brachial plexus injury (Erb's palsy) occurs when the nerves controlling the arm are stretched during delivery, most often during shoulder dystocia. The affected arm may appear limp or have limited movement. The good news is that 80-90% of cases resolve within the first 3-6 months with conservative management and physical therapy.
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.
Should I Use Adjusted Age for My Preemie's Milestones?
Yes — for premature babies, developmental milestones should be assessed using adjusted (corrected) age, not chronological age, until at least 2 years of age. Adjusted age is calculated by subtracting the number of weeks your baby was born early from their actual age. For example, a 6-month-old born 2 months early would have an adjusted age of 4 months, and should be assessed against 4-month milestones. Most pediatricians use adjusted age for developmental assessment through age 2-3, and for growth charts through age 2.
Baby-Proofing a Small Apartment
Baby-proofing a small apartment is absolutely possible and focuses on the same key safety principles as any home: securing furniture to walls, covering outlets, locking cabinets with hazardous materials, and ensuring safe sleep spaces. Small spaces actually have an advantage - there is less area to monitor. Focus on eliminating the most dangerous hazards first: falls, poisoning, choking, and burns.
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.