My Toddler Can't Stack Blocks
The short answer
Stacking 2 blocks typically develops around 13-15 months. By 18 months, most toddlers can stack 2-4 blocks, and by 2 years, 6 or more. Many toddlers prefer knocking towers down before learning to build them, which is normal play behavior. If your child cannot stack 2 blocks by 18 months, mention it at your next visit.
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By Age
What to expect by age
Most babies at this age prefer knocking down towers you build rather than building their own. They may place one block on top of another briefly before it falls. This is the precursor to stacking and is completely normal.
Most toddlers can stack 2-3 blocks during this period. Initial stacking is wobbly and may require several attempts. If your toddler prefers to knock towers down, encourage stacking by making it fun and celebrating their attempts.
Your toddler should be able to stack at least 3-4 blocks. If they cannot stack 2 blocks by 18 months, mention it to your pediatrician. Difficulty stacking can relate to fine motor control, hand-eye coordination, or attention.
Most children can build towers of 6-8 blocks by age 2. If your child cannot stack blocks at all by this age, evaluation of fine motor skills and coordination is recommended.
What Should You Do?
When to take action
- Your toddler is under 15 months and is still learning to stack.
- Your toddler can stack but prefers to knock towers down.
- Your toddler stacks 2 blocks but the tower is wobbly.
- Your toddler recently started stacking and is improving.
- Your child is over 18 months and cannot stack 2 blocks.
- Your child has difficulty placing objects precisely.
- Your child has other fine motor delays alongside stacking difficulty.
- Your child has lost fine motor skills they had.
- Your child's hand coordination is declining.
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Physical Concerns
Baby Not Stacking Blocks
Block stacking is a fine motor milestone that typically begins around 12 to 15 months, when most toddlers can stack 2 blocks. By 18 months, many children can stack 3 to 4 blocks, and by 2 years, a tower of 6 or more. Before 12 months, babies are more interested in grasping, mouthing, and banging blocks rather than stacking them, and that is perfectly appropriate.
My Baby Has Overall Fine Motor Delays
Fine motor skills develop gradually from grasping rattles to using a pincer grip to scribbling and stacking. If your child seems behind in multiple fine motor areas, an occupational therapy evaluation can identify specific areas to work on. Many fine motor delays respond very well to targeted therapy and practice.
Poor Hand-Eye Coordination
Hand-eye coordination - the ability to use visual information to guide hand movements - develops gradually throughout infancy and toddlerhood. Babies begin by swiping at objects they see around 3 to 4 months and progressively become more accurate. It is normal for young children to be "clumsy" with their hands, and precision improves significantly with practice and brain maturation.
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.