When you notice your child isn’t meeting developmental milestones at the same pace as other children, you start to worry. It’s natural to start looking for answers. You may hear terms like developmental delay, global developmental delay, and autism—sometimes before anyone has given you a clear answer about what they mean.
When learning of my child’s autism diagnosis, I found it was so easy to compare every behavior or missed milestone with something I read online. But global developmental delay (GDD) and autism can look similar in young children. No single milestone or behavior tells you which diagnosis fits your child.
The biggest difference is the pattern of development. GDD involves significant delays across multiple areas of development. Autism, by contrast, is characterized by differences in social communication and interaction, along with restricted or repetitive behaviors and interests.
Here, we’ll review how the two conditions overlap and what points clinicians to one or the other. You’ll also learn what you can do while you’re waiting for answers.
Key Takeaways
- Global developmental delay (GDD) means a young child has significant delays in two or more areas of development.
- Autism and GDD can overlap, especially when it comes to speech, communication, motor skills, and social development.
- A child can have both autism and global developmental delay.
- A developmental evaluation can help determine whether your child's differences are part of GDD, autism, another developmental condition, or a combination. If you want help with the next step, you can get started with Alpaca Health.
What Is Global Developmental Delay?
Global developmental delay (GDD) is a term used when a young child is significantly behind expected milestones in multiple areas of development.
Developmental areas include speech and language, movement and motor skills, learning and problem-solving, social and emotional development, and everyday skills such as eating or dressing.
A child who is late to speak but otherwise developing as expected may have a speech or language delay. The word “global” is used to describe children with delays that affect at least two areas of development.
GDD also doesn't tell you why your child is delayed. Instead, it describes their current developmental pattern. Your child's healthcare team may recommend additional testing or evaluations to look for an underlying cause.
You don't have to figure this out alone.
Alpaca Health matches your family with a vetted, in-network BCBA, often within days and with no waitlist. We handle the insurance paperwork so you can focus on your child.
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What Is Autism?
Autism spectrum disorder (ASD) is a lifelong neurodevelopmental condition that affects how a person communicates, interacts with others, learns, and experiences the world around them.
Autistic children have differences in social communication and interaction along with restricted or repetitive behaviors, interests, or activities. How these differences look can vary considerably from one child to another.
For example, my autistic daughter struggled to get her words out. However, another autistic child in her class had an extensive vocabulary but had trouble with back-and-forth conversation. Some children may also repeat movements and phrases, become distressed by changes in routine, or have intense interests.
Developmental delays can occur alongside autism, but they don’t have to be delayed in every developmental area to be diagnosed as autistic.
Global Developmental Delay vs Autism: The Core Difference
The biggest difference is the pattern of your child's development.
With GDD, delays occur across multiple developmental areas. A child with GDD may be behind in language, motor skills, learning, and everyday activities at around the same time.
But with autism, clinicians look for differences specifically involving social communication and interaction. They also will look for restricted or repetitive behaviors and interests.
The distinction can become difficult in very young children. A child with GDD may talk later than other children, play differently, or interact less than other children their age; those behaviors also occur with autism. Instead of looking at one behavior, clinicians consider your child's overall development. They also see whether their social communication differences and repetitive behaviors go beyond what would be expected based on their developmental level.
If you're concerned that your child's developmental differences may be signs of autism, Alpaca Health can help you take the next step toward an evaluation and ABA therapy.
Where the Two Overlap
GDD and autism can look similar. This is especially true during the preschool years, and that's why it can take time for your child's healthcare team to understand their developmental pattern.
Speech and language
You'll find that speech and language delays can occur with both GDD and autism. Your child may use fewer words than expected, have difficulty expressing what they need, or take longer to understand and respond to language.
Clinicians also pay attention to how your child uses communication socially when looking for autism. For example, they may look at back-and-forth communication, gestures, eye contact, and whether your child shares interests or experiences with other people.
Motor skills
In GDD and autism, children may reach motor milestones later than expected. They may also have difficulty with coordination and fine motor skills.
However, a motor delay alone doesn't point to autism. Clinicians will look at your child's overall developmental profile instead of using one delayed milestone, such as walking later, to determine a diagnosis.
Play and social interaction
Children with both conditions show differences in how they play. A child with developmental delays may play in ways that seem younger than expected for their age because their overall development is delayed.
Autistic children may also play differently. Clinicians will look more closely at the social aspects of your child's play. This can include how your child responds to other people, shares attention, imitates others, or engages in back-and-forth interaction.
Signs That Point More Toward Autism
There are some developmental differences that are more characteristic of autism, particularly when they occur together.
These may include:
- Limited back-and-forth social interaction
- Less use of gestures or joint attention to share an experience with someone else
- Repetitive movements, speech, or ways of using objects
- Strong preference for routines or difficulty with changes
- Highly focused or intense interests
- Differences in how your child responds to sensory input
There's no single behavior that confirms autism. Your child may exhibit repetitive movements, but that also occurs in children with GDD. Clinicians look for a broader pattern of social communication differences and restricted or repetitive behaviors.
Signs That Point More Toward Global Developmental Delay
GDD may be more likely when delays spread across several areas of development. The delays aren't limited primarily to social communication and interaction.
For example, your child may be behind in language, motor skills, learning, and daily living skills. However, their social abilities generally match their overall developmental level. The distinction isn't always obvious, especially in very young children.
That's why developmental testing is important. It helps clinicians compare your child's abilities across different areas instead of relying on one symptom or milestone.
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Can a Child Have Both?
Yes. A child can have both global developmental delay and autism.
GDD describes delays across multiple areas of development, and autism describes a specific pattern of social communication differences and restricted or repetitive behaviors. A child can meet the criteria for both.
Having GDD doesn't mean your child will eventually be diagnosed with autism. In fact, some children with developmental delays are autistic, but others aren't. An evaluation helps clinicians understand which diagnosis or combination of diagnoses best describes your child's development.
How Clinicians Tell Them Apart
There isn't a single test that simply tells a clinician whether your child has GDD or autism. They use an evaluation to assess your child's development as a whole.
What an evaluation includes
Your child's evaluation may include a review of their developmental and medical history, conversations with you about their behavior and milestones, and direct observation or developmental testing.
Clinicians may assess areas such as:
- Language and communication
- Cognitive and problem-solving skills
- Fine and gross motor development
- Social interaction and play
- Adaptive skills, such as eating, dressing, or other daily activities
When autism is a possibility, clinicians also look specifically at social communication and interaction, along with restricted or repetitive behaviors. Depending on your child's history and examination, they may recommend additional testing to look for an underlying cause of their developmental delays.
Why a diagnosis can change as your child grows
As a parent, you've probably noticed how quickly your child can develop. Their strengths and challenges often become clear with time. A diagnosis that best describes your child at age 2 or 3 may not fully describe their development several years later.
This doesn't necessarily mean the earlier diagnosis was wrong. GDD is generally used for younger children when developmental and cognitive abilities are still being assessed. As your child grows, clinicians may have more information to make a more specific diagnosis.
What matters most is that your child's needs continue to be evaluated so their services and supports can change along with them.
What Each Diagnosis Means for Therapy and School Services
Therapy should focus on your child's individual needs rather than the diagnosis alone.
A child with GDD may benefit from therapy such as speech, occupational, physical, or other developmental services. An autistic child may use some of these same therapies along with autism-specific supports such as ABA therapy, depending on their needs.
You also don't necessarily have to wait for a final diagnosis to ask for help. Children under age 3 may qualify for early intervention services based on a developmental evaluation. For children 3 and older, families can request an evaluation through their local public school system to determine eligibility for special education services.
What to Do While You Wait for Answers
Waiting for an evaluation can be frustrating, especially when you already know your child needs support.
While you're waiting, you can:
- Talk with your child's pediatrician about your concerns.
- Ask about speech, occupational, physical, or other therapies for specific developmental needs.
- Contact your state's early intervention program if your child is under 3.
- Request an evaluation through your local public school system if your child is 3 or older.
- Write down new skills, behaviors, or concerns you notice to discuss during the evaluation.
You don't have to have every answer before helping your child with the areas where they're struggling.
How Alpaca Health Helps Families After a Delay or Autism Diagnosis
If your child is diagnosed with autism, Alpaca Health can help your family understand the next steps and explore ABA therapy.
Getting a diagnosis can bring new questions about therapy, insurance coverage, and what support your child actually needs.
Get started with Alpaca Health to explore ABA therapy and find support that fits your child's needs.
You don't have to figure this out alone.
Alpaca Health matches your family with a vetted, in-network BCBA, often within days and with no waitlist. We handle the insurance paperwork so you can focus on your child.
Get matched with a BCBA →Frequently Asked Questions About Global Developmental Delay vs Autism
Is global developmental delay the same as autism?
No. GDD and autism are different diagnoses, although they can share some developmental characteristics. GDD involves delays across multiple developmental areas, while autism involves a specific pattern of social-communication differences and restricted or repetitive behaviors.
Can global developmental delay turn into autism?
GDD doesn't "turn into" autism. However, autism may become easier to identify as a young child develops and their developmental pattern becomes clearer.
Can a child have global developmental delay and autism?
Yes. A child can meet the criteria for both GDD and autism. An evaluation can help determine whether your child's developmental profile fits one or both diagnoses. If your child has been diagnosed with autism, Alpaca Health can help your family explore ABA therapy and next steps.
What therapies help with global developmental delay?
Therapy depends on the areas where your child needs support. This may include speech therapy, occupational therapy, physical therapy, and other developmental or educational services.
