Yes, sign language can be genuinely helpful for children experiencing speech delays. When a child’s speech motor system is developing slower than expected, sign language provides a functional communication method while also supporting overall language development—including spoken language. A child might use sign to express “more” during snack time while their speech-language pathologist works on the motor skills needed for speech, reducing frustration and keeping communication flowing.
This article explores the research behind sign language for speech delays, how it works alongside speech therapy, practical ways to introduce it, and what parents should know about combining signed and spoken language. Research consistently shows that learning sign language does not harm spoken language acquisition. In fact, children exposed to both sign and spoken language often develop stronger language skills overall than peers using only one modality. The key is understanding sign language not as a replacement for speech, but as a complement that keeps your child engaged, communicating, and learning while waiting for their speech systems to mature.
Table of Contents
- Does Sign Language Actually Help Children with Speech Delays?
- How Sign Language Develops Language Skills in Children with Speech Delays
- Sign Language as a Bridge, Not a Barrier to Speech
- Starting Sign Language with Your Child with Speech Delay
- Combining Sign Language with Speech Therapy
- Real-World Example: Communication Without Frustration
- Thinking Beyond Speech Delay
- Conclusion
- Frequently Asked Questions
Does Sign Language Actually Help Children with Speech Delays?
The short answer is yes, supported by peer-reviewed research. A landmark study by Linda Acredolo and Susan Goodwyn compared families using signs with their 11-month-old children to control groups, and the signing group demonstrated better overall language skills than comparison groups. More specific to speech delays, research on children with specific language impairment showed they learned twice as many words when those words were presented in both speech and sign compared to words presented through speech only. This doubling effect is significant—it means your child’s brain absorbs more linguistic information when you combine modalities.
The American Speech-Language-Hearing Association (ASHA) has explicitly stated that “Acquisition of sign language does not harm spoken vocabulary acquisition.” This addresses a common parental fear that sign language might somehow interfere with speech development. It doesn’t. Instead, sign language may facilitate rather than hinder vocal language development, particularly when children are waiting for their speech motor systems to mature. One important caveat: research on baby sign language in popular media often lacks rigorous methodology, so while parent reports are encouraging, the empirical evidence base is still developing.
How Sign Language Develops Language Skills in Children with Speech Delays
When a child has a speech delay, the problem often isn’t their understanding of language or their desire to communicate—it’s the motor ability to produce speech sounds. Sign language bypasses this motor bottleneck entirely. A child can express complex thoughts through sign even if their mouth can’t form the words yet. This prevents communication frustration and keeps the child engaged with language learning. Beyond communication, sign language teaches the structural patterns of language itself.
Your child learns that objects have names, that concepts can be modified (bigger, finished, want-more), and that communication is a back-and-forth process. Bilingual deaf and hard of hearing children provide important evidence here: research showed a positive correlation between ASL (American Sign Language) vocabulary size and spoken English vocabulary size. This suggests that building vocabulary in one language supports vocabulary building in another. However, if your child is learning sign language at home but has limited exposure to signed conversation (maybe only during therapy sessions), the benefits plateau. Sign language works best with consistent, interactive use throughout daily life—not just during therapy appointments.
Sign Language as a Bridge, Not a Barrier to Speech
One of the biggest concerns parents express is whether sign language will prevent their child from developing speech. This concern isn’t supported by research. No well-designed empirical studies have shown that sign language exposure causes poor spoken language outcomes. When children grow up exposed to both signed and spoken language, their brains treat both as legitimate communication systems. This is different from choosing sign instead of speech—it’s adding sign alongside speech development efforts. Think of it this way: if you moved to a bilingual country where Spanish and English were both spoken, learning Spanish wouldn’t prevent you from becoming fluent in English.
Your brain would develop capacity in both. The same applies to sign language and spoken language. The brain doesn’t see these as competing modalities; it sees them as tools for different contexts and communication partners. The limitation here is that this research assumes continued exposure to spoken language through family, speech therapy, or both. If a child has sign language available but zero exposure to spoken language or speech therapy, then yes, they’re less likely to develop speech. But that’s a limitation of exposure, not an issue with sign language itself.
Starting Sign Language with Your Child with Speech Delay
Introducing sign language to your child doesn’t require any special equipment or formal program—it starts with you signing in daily routines. Start with high-frequency, concrete signs: eat, drink, more, all-done, mom, dad, help. When your child reaches for a snack, sign “eat” or “more” while saying it. At bathtime, sign “water” and “wash” while narrating what you’re doing. These aren’t formal lessons; they’re naturally occurring moments where your child sees language being used.
A practical comparison: formal sign language classes (like those targeting hearing parents of deaf children) teach comprehensive ASL structure and Deaf culture. These are valuable if you’re committed to raising a bilingual child. However, for a child with speech delay, functional home signs often provide sufficient benefit without requiring the same time commitment. many families use a hybrid approach—learning basic functional signs at home and potentially exploring more structured sign language learning if it becomes important as the child grows. The key difference is intentionality: home signs need consistent use and modeling, or your child won’t pick them up reliably.
Combining Sign Language with Speech Therapy
Sign language and speech therapy aren’t competing treatments—they’re complementary. During speech therapy, a child might work with their therapist on producing specific sounds or word approximations. At home, you’re supporting communication through sign while those motor skills develop. Some speech-language pathologists enthusiastically recommend home sign support; others are less familiar with it. If your child’s SLP hasn’t mentioned sign language, it’s reasonable to ask: “Would signing at home support my child’s overall communication while we work on speech?” However, if your child’s speech delay has a specific underlying cause (hearing loss, apraxia, dysarthria), that diagnosis shapes how sign language fits into the bigger picture.
A child with significant hearing loss might benefit from a stronger commitment to ASL and a cochlear implant or hearing aids. A child with apraxia (difficulty planning the motor sequences for speech) might use sign as a communication bridge while working intensively on speech motor planning through therapy. A child with dysarthria (muscle weakness affecting speech) might use sign as their primary communication method if speech remains severely limited. These aren’t separate decisions—speech diagnosis informs sign language strategy. If you haven’t had a clear diagnosis for your child’s speech delay, that’s worth pursuing before building your communication plan.
Real-World Example: Communication Without Frustration
Imagine Marcus, a two-year-old with a moderate speech delay. He understands language well and has lots to say, but when he tries to speak, he struggles with articulation and gets frustrated when people don’t understand him. He starts refusing to try to talk, which actually slows language development because he’s avoiding communication. His parents learn about 20 functional signs: more, all-done, help, pain/hurt, thank you, up, down, water, food, and a few others. Marcus learns these quickly—much more quickly than he’d learn to say those words clearly. Now when he wants water, he signs it. When he’s done eating, he signs all-done.
His frustration drops dramatically because he can reliably communicate his needs. Simultaneously, his speech-language pathologist is working on the motor skills for speech. Over time, Marcus begins combining signs with approximations of words. “Water” might come out as “wa-wa,” but he’s signing “water” at the same time. His parents recognize this as progress—the sign supports the emerging speech. By age four, Marcus is speaking more clearly, though he still uses sign in moments of frustration or when speed matters. He’s developed a bilingual communication style, which research suggests supports overall cognitive development.
Thinking Beyond Speech Delay
For many families, sign language becomes valuable not because it solves the speech delay, but because it expands communication options long-term. A child might outgrow speech delay entirely—many do—but retain sign language as an accessible communication tool in noisy environments, at a distance, or as part of their identity. This is particularly true if the child has Deaf relatives or is growing up in a bilingual Deaf-hearing family.
Even if the speech delay resolves, sign language skills don’t disappear; they become an asset. Additionally, the confidence-building that comes from successful communication during early delays can have long-term effects on willingness to communicate, social-emotional development, and learning. A child who spent ages two and three with reliable communication tools is less likely to develop secondary behavioral issues around frustration and withdrawal. This isn’t just about the language itself—it’s about the communicative confidence that helps children engage with people and learning.
Conclusion
Sign language is a legitimate, research-supported tool for children with speech delays. It doesn’t hinder speech development; instead, it provides communication access while motor systems mature. The research is clear: children exposed to both sign and spoken language develop stronger language skills than those with access to only one modality, and children with specific language impairment learn significantly more words when those words are presented in both speech and sign.
The key to success is consistent, interactive use—signs in daily routines, at home, not just in therapy—combined with ongoing speech development support. If your child has a speech delay, conversations with your speech-language pathologist about adding home signs are worthwhile. Start with functional, high-frequency signs that serve your child’s communication needs right now. You’re not choosing sign language over speech; you’re providing communication tools while speech motor systems develop.
Frequently Asked Questions
Will sign language delay my child’s speech development?
No. Research from the American Speech-Language-Hearing Association confirms that learning sign language does not harm spoken vocabulary acquisition. Children who learn both sign and spoken language often develop stronger language skills overall than peers with access to only one modality.
How quickly do children learn to sign?
Functional home signs are learned faster than comparable spoken words, often within weeks of consistent modeling. Children typically understand signs before they can produce them reliably, just as they understand spoken words before they speak.
Should we use “baby sign” or formal ASL?
Both can be helpful, but for functional communication support during speech delay, home signs adapted from ASL or SEE (Signed Exact English) work well. Formal ASL is valuable if you’re committed to bilingual language development or have Deaf family members.
What if my child’s speech therapist hasn’t mentioned sign language?
Bring it up. Ask whether signing at home might support your child’s communication while speech motor skills develop. Not all SLPs have training in sign language, but many recognize its value as a complementary approach.
Can we stop using signs once my child’s speech improves?
You can, but you don’t have to. Many children who learn signs in early childhood continue using them occasionally—in noisy situations, at distance, or when they want to communicate quickly. It becomes another tool rather than a necessity.
How many signs should my child learn?
Start small—20 to 30 functional signs related to your child’s daily activities and needs. Expanding too quickly can be overwhelming. Quality and consistent use matter more than quantity.