When to Talk to Your Pediatrician About Development

Every parent eventually has a moment of wondering whether something they’ve noticed is actually worth mentioning at the next appointment, or whether they’re overreacting to normal variation. It’s a hard read to make from the inside, especially with a first baby and no real basis for comparison. Here’s how pediatric guidance actually distinguishes ordinary variation from something worth a closer look, and how the process works if you do raise a concern.

Monitoring versus screening, and why the difference matters

Pediatric care uses two related but different tools to track development, and understanding the distinction makes the whole process feel less mysterious. Developmental monitoring, sometimes called surveillance, is the ongoing, informal tracking that happens at every well-child visit and in the observations you make as a parent day to day. It’s not a test; it’s more like keeping an eye on the overall trajectory.

Developmental screening is different: it’s a formal, standardized questionnaire or checklist, validated by research, administered at specific ages regardless of whether anyone has a particular concern. The point of screening at set intervals rather than only when something seems off is that it catches things a busy visit or a parent too close to the situation might miss. The AAP recommends general developmental screening at 9, 18, and 30 months, with additional autism-specific screening at 18 and 24 months given how much earlier reliable identification has become possible.

If your pediatrician hands you a questionnaire at one of these visits, it’s standard practice, not a sign they’ve noticed something wrong. Most children screen typically at every stage.

What happens if a screening flags something

A positive screen isn’t a diagnosis, and it’s worth not panicking if one comes back with concerns noted. It generally means a referral to a more detailed evaluation, either through your country’s early intervention system (in the US, this is typically a state-run program for children under 3, transitioning to school-based services after) or a specialist evaluation. That evaluation looks in much more depth at the specific area of concern. Depending on the result, your child may qualify for services like speech therapy, occupational therapy, or physical therapy, often provided at low or no cost through public early intervention programs. Importantly, a lot of children who get referred for evaluation turn out not to need ongoing services, or need support in only one narrow area; a referral is a step toward more information, not a verdict.

Red flags across the first two years

Rather than a single list, it helps to think in terms of a few broad categories that come up again and again: motor development (movement and strength), communication (sounds, words, understanding), social engagement (connecting with people), and cognitive skills (problem-solving, understanding how objects and people work). A few markers pediatric guidance treats as worth a conversation, organized roughly by age:

In the first few months, signs worth mentioning include a baby who doesn’t startle at loud sounds, doesn’t briefly track a moving object with their eyes, isn’t smiling at people by around 3 months, or feels unusually floppy or unusually stiff when you pick them up.

Around 6 to 9 months, it’s worth a conversation if a baby shows no affection toward familiar caregivers, isn’t babbling sounds like “mama” or “baba” by 9 months, doesn’t respond at all to their name, isn’t sitting with support by 9 months, or doesn’t bear any weight on their legs when held upright.

Around the first birthday, red flags include not crawling, not being able to stand while holding onto something, not using any words like “mama” or “dada” specifically toward the right person, not waving bye-bye, or not being able to find an object you’ve hidden while they watched.

Between 18 months and 2 years, worth-mentioning signs include a vocabulary stuck under about six words, not gaining new words over time, not pointing to show you something interesting, not walking, not attempting simple two-word combinations like “more milk” by age 2, or not following simple one-step instructions.

The single most important red flag

Across every age, one signal matters more than any specific missed milestone: losing a skill your child previously had. A baby who was babbling and stops, a toddler who had a handful of words and goes quiet, a child who could walk and stops attempting it, these are worth calling about promptly rather than waiting for the next scheduled visit, regardless of what age or stage your child is otherwise at. Skill loss is a different category of concern than simply being a bit behind on a specific milestone, and pediatricians treat it accordingly.

Trusting your own read between visits

You don’t need to wait for a screening questionnaire to raise something you’ve noticed. You know your child’s day-to-day behavior in a way a 20-minute appointment can’t capture, and a good pediatrician treats a parent’s specific, concrete observation as useful information rather than something to wave away. It helps to be specific when you bring something up: rather than “I’m worried about his talking,” something like “he had about ten words at 15 months and hasn’t added any new ones in two months, and he used to point at things he wanted and doesn’t anymore” gives your pediatrician something concrete to evaluate rather than a general anxiety to reassure you about.

If a concern is dismissed in a way that doesn’t sit right with you, it’s reasonable to ask directly about a referral for further evaluation or screening, or to seek a second opinion. This isn’t about being adversarial with your pediatrician; it’s that you’re allowed to advocate for a closer look even when the initial read is reassurance.

Keeping a simple log before your appointment

You don’t need anything elaborate, but a short written note in the weeks before a visit can make a real difference in how useful the conversation is. A few lines in a notes app is enough: what you’ve noticed, roughly when you first noticed it, and whether it’s stayed the same, gotten better, or gotten worse. If it’s something visual, like an unusual movement, a persistent head tilt, or the way your baby reaches for objects, a short video on your phone is often more useful than a description, since it’s hard to fully capture motion in words and easy to forget the exact detail by the time you’re sitting in the exam room. Pediatricians see a lot of patients in a short window, and walking in with something concrete, even just two sentences and a 15-second clip, tends to get a more thorough response than an open-ended “he seems behind.”

It’s also fine to bring this up by email or through a patient portal message ahead of the visit if your clinic offers that, so your pediatrician has a moment to think about it before you’re both in the room. That’s not overstepping, and most practices would rather get a heads-up than have a significant concern raised for the first time in the last two minutes of a fifteen-minute appointment.

When family tells you not to worry

It’s extremely common to notice something, bring it up with a relative or friend, and be told you’re overthinking it, that a cousin or sibling did the exact same thing and turned out fine. Sometimes that’s true and genuinely reassuring. But other people’s development stories, even close family, aren’t a substitute for an actual evaluation, and a well-meaning “he’ll grow out of it” isn’t information your pediatrician has access to. It’s reasonable to listen to that reassurance without letting it talk you out of mentioning something at your next visit, or moving up an appointment if it feels urgent enough to not wait. You’re not being dramatic by asking a professional to take a look at something family members are confident is nothing; that’s a fairly low-cost way to either get real peace of mind or catch something early, and either outcome is worth the ten-minute conversation.

Adjusting for premature babies

If your baby was born early, use adjusted age (counted from your original due date, not your baby’s birth date) when thinking about where they should be developmentally, generally through at least the first two years. A baby born 10 weeks early who isn’t yet babbling at what would be their actual 9-month mark may be right on track for their adjusted 6-and-a-half-month age. Most pediatricians build this adjustment in automatically for preemies, but it’s worth confirming they’re using adjusted rather than chronological age when discussing any specific concern, especially in the first two years.

Hearing and vision are part of this conversation too

A meaningful share of what looks like a language or social delay actually traces back to a hearing issue that hasn’t been caught, since a baby who can’t hear well has a harder time babbling, responding to their name, or building vocabulary on the expected timeline, not because anything else is wrong but because the input isn’t reaching them clearly. Most places routinely screen hearing shortly after birth, but hearing can also change later from things like chronic ear infections and fluid buildup, so if a language delay is the primary concern, asking specifically about a hearing check is a reasonable and often overlooked step. The same logic applies to vision: a baby who doesn’t track objects or make eye contact as expected is sometimes dealing with a vision issue rather than, or alongside, another kind of delay.

Country-specific notes worth knowing

The AAP’s 9/18/30-month general screening schedule with autism-specific screening at 18 and 24 months is the US standard, but the underlying practice of routine, staged developmental screening at well-child visits is common across the UK, Canada, and Australia as well, generally delivered through health visitors in the UK, pediatricians or family doctors alongside tools like the Rourke Baby Record in Canada, and maternal and child health nurses in Australia. Early intervention systems also exist in all four countries, though the exact eligibility process and what it’s called varies locally; your pediatrician, health visitor, or child health nurse can point you to the right referral pathway in your specific location.

FAQ

My pediatrician isn’t worried, but I still feel uneasy. What should I do?

It’s reasonable to ask directly for a referral to a specialist or a formal screening if you’re not satisfied, or to get a second opinion. Trust your instinct enough to keep advocating, even after an initial reassurance.

Does a positive developmental screen mean my child has a diagnosis?

No. A positive screen means a referral for closer evaluation, not a diagnosis on its own. Many children referred after a screening don’t end up needing ongoing services, or need support in only one specific area.

Is it too late to raise a concern if my child is already past the age where a particular milestone should have happened?

No. Evaluation and early intervention services remain useful at any age; earlier tends to make more of a difference, but raising a concern later than you’d have liked is still worth doing rather than not doing at all.

The bottom line

Developmental screening exists precisely because it catches things that are easy to miss in the day-to-day of raising a baby, and a positive result is a referral for more information, not a diagnosis to panic over. The clearest signal to act on quickly is losing a skill your child previously had, at any age. Beyond that, you don’t need to wait for a scheduled screening to bring up something specific you’ve noticed, and it’s entirely reasonable to keep pushing for a closer look if an initial conversation doesn’t put your mind at ease.