Autism is rarely diagnosed before age two, but subtle developmental differences can sometimes appear within the first few months of life. Common early signs of autism in newborns include limited eye contact, no social smiling by around eight weeks, weak tracking of faces, minimal reaction to sound, and resistance to cuddling.
In most cases, a baby who doesn’t smile or follow a caregiver’s gaze does not have autism. However, if you notice several of these differences or they’re becoming more consistent over time, it’s a good idea to bring them up with your child’s doctor. In this article, we’ll explore the early signs of autism in babies so that you can stay attuned to your newborn’s development with more confidence and reassurance.
What Are the Earliest Signs of Autism in Newborns?
Every baby develops at their own pace, and many children reach milestones a little earlier or later than others. However, there are certain early behaviors that pediatricians pay close attention to during the first few months.
If your newborn consistently isn’t making eye contact, smiling at familiar faces, following movement with their eyes, or responding to people, it doesn’t necessarily mean they have autism — but it’s worth bringing up during a checkup. Here are some of the early signs of ASD in newborns that pediatricians look for.
Reduced eye contact and limited social smiling
A baby with early signs of autism may make limited eye contact or rarely smile back at familiar faces. By around two months, most babies begin making eye contact and smiling in response to someone’s voice, smile, or face. As they approach four months, these social interactions typically become more frequent and consistent.
Weak tracking of faces and moving objects
Difficulty visually tracking other people or things is another subtle warning sign of autism in newborns. By around 2-3 months, babies typically start to follow faces and objects with their eyes. Starting around 6-9 months, babies will begin to develop joint attention, or the ability to either respond to or initiate shared focus on an item or event.
| Developmental Area | Typical at 0–3 Months | Possible Autism Sign |
| Eye contact | Begins around 6–8 weeks, increases steadily | Absent or fleeting past 8–10 weeks |
| Social smiling | Reflexive smile in response to a caregiver’s face | Little to no social smile by 8–12 weeks |
| Visual tracking | Follows faces and moving objects with eyes | Doesn’t follow faces or objects consistently |
| Response to sound | Startles or turns toward voices/noise | No reaction, or extreme over-reaction |
| Response to touch/cuddling | Settles or relaxes when held | Stiffens, resists, or seems indifferent to holding |
How Do Newborns With Autism Respond to Sound and Touch?
Sensory differences alone don’t indicate autism, but they may be one of several differences your pediatrician monitors over time alongside other diagnostic criteria. These sensory differences include:
Unusual reactions to noise and sensory input
Some babies with autism may react more strongly than expected to everyday sounds or touch, while others may seem underresponsive. For example, they may become very distressed by normal household noises or barely react to loud sounds.
Resistance to being held or comforted
Most babies enjoy being held and soothed by a caregiver. If your newborn consistently seems uncomfortable in someone’s arms or doesn’t settle when held, it may reflect early differences in social interaction or sensory processing.
When Do Autism Signs Typically Become Noticeable?
While some autism red flags in newborns can appear during the first few months of life, many babies won’t show clear or consistent signs this early. As babies approach one year and develop new social and communication skills, signs of autism often become easier to recognize.
Signs at 0-3 months vs. 6-12 months
Early signs of autism often look different depending on a baby’s age. During the first three months, pediatricians look for subtle differences in early social behaviors, such as reduced eye contact or difficulty tracking faces or moving objects.
Between six and 12 months, developmental differences often become more noticeable as babies are expected to reach additional social and communication milestones. Delays in babbling, responding to their name, using gestures like pointing or waving, or developing joint attention may prompt a healthcare provider to recommend further evaluation.
Why a formal diagnosis usually isn’t possible yet
Autism is rarely diagnosed before 18 months because many of the social, communication, and behavioral differences used to identify autism are still developing. That’s why the CDC and the American Academy of Pediatrics (AAP) recommend autism screening at 18- and 24-month well-child visits, when a diagnosis becomes more reliable.
Even so, many children aren’t diagnosed until preschool or elementary school when social or behavioral challenges can be more obvious. At that stage, ABA therapy for preschoolers may be recommended as part of a child’s individualized treatment plan.
What Should Parents Do Next?
If you’re concerned about your newborn’s delayed milestones, you’re not alone. Many parents have similar questions during the first few months of their baby’s life — whether it’s about their child’s lack of social smiling or frequent crying even when held.
While it’s important to bring any concerns to the attention of your pediatrician, keep in mind that one delayed milestone isn’t usually enough to suggest autism. Instead, your pediatrician will look at your baby’s overall development and monitor their progress over time.
Talking to a pediatrician about your concerns
It’s not always easy to voice concerns about your baby’s development. Oftentimes, parents think that they must be overreacting. However, your pediatrician wants to hear these concerns. Your child’s doctor is there to help you understand what’s typical, monitor progress over time, and recommend additional support if it’s needed.
To help your pediatrician get a complete picture, be sure to write down the behaviors you’ve noticed, when they started, and how often they happen. Your pediatrician will be able to reassure you of what’s typical and what’s worth further monitoring. They may also refer you for a developmental evaluation to see if early intervention is necessary.
The value of early intervention services
The CDC and the American Academy of Pediatrics (AAP) recommend early autism screening for a reason. During the first few years of life, a child’s brain is growing rapidly — making it an ideal time to identify developmental differences and begin support when needed.
If your pediatrician has concerns about your child’s development, they may recommend an early intervention evaluation. Early intervention connects babies and young children with services that support their development, such as speech therapy, occupational therapy, physical therapy, or early intervention ABA therapy.
The sooner children receive support, the more opportunities they have to build social, motor, and everyday life skills when their brains are primed for learning. And remember, being referred for early intervention doesn’t mean your child has autism — many developmental differences have explanations other than autism. Either way, addressing these concerns early gives your child as much time as possible to strengthen their development.
Trust Your Instincts and Act Early
Your pediatrician is the medical expert, but you know your child best. If something about your baby’s development feels different — even if it seems small — don’t ignore your concerns. Trust your instincts and bring them up at your child’s next appointment or sooner if you’re worried.
Taking action early doesn’t mean expecting the worst. It simply ensures your child has the opportunity to receive support if it’s needed.
If you have concerns about your baby’s development, United Care ABA is here to help you understand your next steps. Read through our parent resources for more information on autism, or contact United Care ABA to learn how we can help your child get the support they need.
FAQs
Can autism be detected in a newborn?
Not formally. The CDC and AAP note that a reliable ASD diagnosis typically isn’t made until 18–24 months. Some developmental differences, like reduced eye contact or social smiling, can be noticed in the first few months and are worth monitoring, but they don’t confirm autism on their own.
Do newborns with autism smile less?
Some research suggests infants later diagnosed with autism show less frequent social smiling during their first year of life. A single quiet week isn’t a red flag, a persistent, consistent pattern is what pediatricians want to hear about.
Why won’t my newborn make eye contact?
Most newborns begin making steady eye contact between 6 and 8 weeks old. Inconsistent eye contact before then is common and usually not a concern; a continued lack of eye contact past 2–3 months is worth mentioning at a checkup.
What should I do if I notice possible autism signs in my newborn?
Bring specific examples to your next pediatrician visit rather than waiting for a scheduled screening. Your pediatrician can track the pattern over time and refer you to a developmental specialist if warranted.
Is it too early to start early intervention?
No. Early intervention services can often begin based on observed developmental delays, even before a formal ASD diagnosis is made. Acting on a pediatrician’s referral early gives the widest window for support.
