No, baby sign language does not delay talking. This is one of the most persistent myths in early childhood development, but the scientific evidence is clear and consistent: research has found no evidence that exposure to sign language harms spoken language development. In fact, hearing children of deaf parents who use sign language with their children actually show earlier language milestones—acquiring their first signs as early as 5.5 months, with an average of 8.5 months, which is earlier than typical spoken first words.
This article covers what the research actually shows, how bilingual exposure to both sign and spoken language supports development, and why parents who use baby sign language can feel confident they’re supporting their child’s communication growth, not hindering it. The concern about sign language delaying speech likely stems from a misunderstanding about how bilingual development works. When children are exposed to multiple languages or modalities (in this case, both visual sign language and spoken language), they sometimes show a temporary slower growth in one language while they’re building vocabulary across both systems. However, this is not a delay—it’s a normal part of multilingual development, and the overall language advantage is significant.
Table of Contents
- What Does the Research Actually Say About Baby Sign Language and Speech Development?
- How Do Speech Milestones Compare Between Children Learning Sign Language and Spoken Language?
- Bilingual Development—Understanding How Sign and Spoken Language Work Together
- Starting Baby Sign Language—Practical Approaches for Parents
- Common Misconceptions and Why the “Delay” Myth Persists
- When to Seek Professional Support
- The Long-Term Advantages of Early Sign Language Exposure
- Conclusion
- Frequently Asked Questions
What Does the Research Actually Say About Baby Sign Language and Speech Development?
Multiple research institutions and speech-language pathology organizations have studied this question directly. A comprehensive literature review of the scientific evidence concluded that “acquisition of sign language does not harm spoken vocabulary acquisition.” This finding comes from institutions like the UC Davis Language Learning Lab, the Hanen Centre, and speech therapy specialists who reviewed all available studies on the topic. The studies consistently show no negative correlation between sign language exposure and spoken language development.
In fact, the direction of the research tilts toward advantages. Speech-language pathologists and developmental experts across multiple institutions have reached expert consensus on this: baby sign language does not delay speech development. For a parent choosing to introduce signs to their baby alongside spoken language, the research provides reassurance that this is a safe developmental choice.
How Do Speech Milestones Compare Between Children Learning Sign Language and Spoken Language?
When children are exposed to both sign and spoken language from infancy, their development follows an interesting pattern. Hearing children of deaf parents who use sign language acquire their first signs between 5.5 months and their expected signing developmental window, with an average first sign at 8.5 months—this is notably earlier than typical spoken first words, which usually emerge around 10-14 months. The comparison becomes even more striking when looking at vocabulary growth. Research demonstrated that 24-month-olds using sign language performed at the same level as typical 27- to 28-month-olds in overall communication abilities.
By age 3, the advantage becomes substantial: 36-month-olds who use sign language performed at the level of typical 47-month-olds. This means bilingual exposure to sign language is actually associated with stronger verbal skills and more advanced cognitive development. However, it’s important to note that not all settings provide equal exposure to both languages—children need consistent, fluent models of both sign and spoken language to realize these advantages. A child exposed to minimal sign language or inconsistent spoken language input may not show the same benefits.
Bilingual Development—Understanding How Sign and Spoken Language Work Together
When a child is exposed to two languages or language modalities, their brain is not splitting cognitive resources in a way that harms either system. Instead, bilingual children develop integrated language systems. The research on sign language and speech specifically shows that signing babies develop larger vocabularies overall when you count signs and words together.
The key difference from monolingual development is that a bilingual child might have 500 signs and 200 words, for example, whereas a monolingual English-speaking child of the same age might have 700 words. parents sometimes misinterpret this as a “delay” in English vocabulary, but the child is actually building a larger total language system. The research shows that when these children are followed over time, they catch up in spoken language and often exceed peers in reading ability and overall literacy skills later in childhood. This is why speech-language pathologists who understand bilingual development support families in maintaining both languages rather than discouraging one.
Starting Baby Sign Language—Practical Approaches for Parents
If you’re considering introducing baby sign language, the practical question often becomes: how much sign exposure does my child need to benefit? There’s no minimum threshold research has identified as “not enough,” but consistency matters more than intensity. A parent who uses a few hundred signs regularly with their child creates a more supportive language environment than a parent who uses thousands of signs inconsistently. For families with deaf parents or close family members who use sign language, the choice is straightforward—the child is already immersed in both languages. For hearing families without deaf family members, the decision is more intentional.
Some families learn sign language with their babies to introduce it as an early communication tool (research shows signed language can reduce frustration in pre-speaking toddlers because children can produce signs earlier than words). Other families focus primarily on spoken language and leave sign language for potential future learning. Neither choice creates a language delay; the research shows that hearing children develop typical speech whether or not they’re exposed to sign language. The advantage of early sign exposure appears when it’s paired with consistent spoken language input—not sign language in isolation.
Common Misconceptions and Why the “Delay” Myth Persists
The persistent myth about sign language delaying speech likely has several sources. First, bilingual children do sometimes show a pattern where one language develops slightly more slowly than it would in a monolingual child, while overall language development is ahead. Parents or professionals unfamiliar with bilingual development patterns might interpret this as a delay rather than a normal distribution across two systems. Second, there’s historical stigma around sign language in educational settings that created outdated beliefs about its impact on spoken language development.
A crucial limitation in the research is that most studies focus on children with consistent exposure to both fluent signed and spoken language. Children who receive inconsistent, non-native sign language input or minimal spoken language exposure may not show the same advantages. This is why the quality of language modeling matters: a parent or caregiver who uses sign language fluently is more beneficial than a parent learning sign language at the same pace as the child. If a family is committed to sign language, getting quality instruction and consistent input for the child is more important than the quantity of signs learned.
When to Seek Professional Support
Most children exposed to baby sign language develop communication exactly on track with expected milestones when accounting for bilingual patterns. However, if a child isn’t developing language skills in either sign or speech by expected ages, that’s worth addressing with a developmental professional—not because sign language caused concern, but because any child with language development that’s falling behind their peers deserves assessment.
A speech-language pathologist familiar with bilingual and deaf/hard-of-hearing development can assess whether a child is actually delayed or simply distributing language learning across two systems. This distinction is important for getting the right support.
The Long-Term Advantages of Early Sign Language Exposure
Beyond the immediate developmental advantages in infancy and early childhood, exposure to sign language appears to support long-term literacy and cognitive benefits. Children who grow up bilingual in sign and spoken language often show advantages in reading and writing during school years.
This makes sense from a neurolinguistic perspective: bilingual brains are making more connections between language concepts, visual-spatial processing, and abstract language representation. For families considering baby sign language, the research suggests viewing it not as a neutral choice but as a developmental advantage—provided the child has consistent, high-quality exposure to both sign language and spoken language. The days of worrying that signing will harm speech are behind us; the modern evidence points toward it supporting overall language and cognitive development.
Conclusion
The question “Does baby sign language delay talking?” has a clear scientific answer: no. Decades of research across multiple institutions has found no evidence that exposure to sign language interferes with speech development. Children exposed to both sign and spoken language from infancy actually achieve language milestones earlier on average, build larger overall vocabularies, and show more advanced cognitive development compared to peers.
This remains true whether the child has deaf parents who naturally use sign language or hearing families who intentionally introduce it as an early communication tool. If you’re a parent considering baby sign language, the research supports your choice as safe and potentially advantageous. The key is ensuring your child has consistent exposure to both sign language and spoken language from fluent models, so both systems can develop robustly. Talk with your pediatrician or a developmental professional if you have specific concerns about your child’s language development—not to discourage sign language, but to ensure they’re getting any additional support they might need.
Frequently Asked Questions
At what age can babies start learning sign language?
Babies can begin learning sign language from birth, just as they do spoken language. Research shows hearing children of deaf parents acquire their first signs as early as 5.5 months old, with an average age of 8.5 months.
Will baby sign language prevent my child from speaking?
No. The scientific evidence consistently shows that sign language exposure does not interfere with speech development. In fact, children with early sign language exposure often develop stronger overall language skills.
Do hearing children of deaf parents have speech delays?
No. Hearing children raised by deaf parents who use sign language typically develop speech normally, often through exposure to spoken language from other family members, media, and community. They also learn sign language fluently.
What if I’m the only person teaching my child sign language?
This can still be beneficial, though consistency matters. Your child will benefit most if you learn and use sign language fluently rather than learning together at the same pace. Many families take formal sign language classes to provide better models for their children.
How much sign language exposure is needed to prevent speech delay?
There’s no minimum threshold. However, consistent, regular exposure to sign language paired with ongoing exposure to spoken language supports development. A parent using sign language regularly is more beneficial than rare or sporadic use.
Will my child become bilingual, or will they prefer one language over the other?
Most children raised with both sign and spoken language naturally use both, often in context-dependent ways. They typically prefer the language modality used by their primary communication partners in different settings.