Do Early Childhood Milestones Predict How Your Kid Turns Out Later?
I was sorting old cardboard boxes in the basement last weekend, looking for my oldest daughter’s soccer cleats she suddenly needed for practice, when I hit the hard, cardboard spine of my first kid’s baby book. It fell open to the milestone checklist, the one every pediatrician’s office hands you, with little checkboxes next to “walks alone,” “says 10+ words,” and “uses a cup independently.”
I remembered immediately how that went for each of my kids. Lila, my oldest, checked every box 2 to 3 months before the average age listed. She walked at 9 months, when most kids are still cruising along furniture. She said full sentences like “I want the blue cracker, please” at 18 months. The pediatrician wrote “advanced development” in bold at her 2-year checkup, and I went home and mentioned it casually in my new mom group, preening a little. I won’t lie, I thought I’d done something right, that I had a uniquely smart kid on my hands.
Jax came three years later, and the story was completely different. He didn’t take his first unassisted step till 16 months. At his 2-year checkup, he had 8 words total, mostly things like “milk” and “car.” The pediatrician ticked the “delay” box, referred us for early intervention and a formal speech evaluation. I sat in my minivan in the parking lot after that appointment and cried, scrolling through milestone blogs at a red light, convinced he’d struggle in school forever, that I’d missed some critical window of development.
Jax wandered down the basement stairs while I was staring at the old notes, leaning against the dryer waiting for me to find the cleats and drive him to robotics practice. “What’s that?” he said, leaning over my shoulder. I showed him the entry. He laughed, loud, the kind of snorty laugh 13-year-olds pull out when they find something ridiculous. “You guys were worried I’d never talk? That’s so dumb. I just had nothing to say till I figured out how engines work.” Lila heard us laughing from the top of the stairs, came down to see what the fuss was about. She grabbed the book, saw her bold “advanced” note, and rolled her eyes. “Wow, that’s a lie. I’ve been stuck on my college application essay for three weeks. If I was so advanced back then, why can’t I write a 500-word paragraph about my ‘greatest achievement’?”
That exchange got me thinking about the question I see so many new parents ask online: do these early milestones actually mean anything for who your kid becomes later?
The short answer I’ve landed on, after 16 years of parenting two kids on opposite ends of the early milestone timeline, is: milestones are a screening tool, not a crystal ball. That’s it. When Jax was delayed, the early intervention was helpful—his speech therapist gave him little, low-effort games to play that helped him put words to the things he was already noticing. But the panic I felt, the idea that his late start meant he’d always be behind? That was all for nothing. On the flip side, Lila’s early start made me think she’d always be ahead, and that complacency made me miss the fact that she was struggling with longer reading assignments for a full year before I realized she needed accommodations for dyslexia. I assumed because she hit all the early marks, she didn’t need extra help. I was wrong.
What do I tell other parents now when they message me worrying if their kid is on track? First, instead of staring at the checklist counting words or months since they first walked, do this: tonight, write down three things your kid did this week that they mastered that aren’t on that list. When Jax was 2, I was so focused on counting his words that I barely noticed he could put together a 24-piece puzzle by himself in 5 minutes, that he could stack a tower of blocks as tall as his high chair without it falling, that he’d sit and watch a construction worker down the street for 20 minutes, completely enthralled. None of that is on the standard milestone checklist, but that’s the stuff that’s still him: he’s the kid who can spend 3 hours troubleshooting a broken robot motor, who can look at a pile of scrap metal from the junkyard and see a working go-kart. That’s the stuff that matters more than when he first said “mama.”
Second, don’t put too much stock in early “success” on milestones either. It’s easy to think an early walker or early reader means your kid is going to be a star student, but milestones only measure the skills that pop up first, not all the skills that matter long-term. Lila’s early language skills meant she could talk a lot at 2, but she always processed dense written information slower than her peers. Because everyone assumed she was advanced, I didn’t push for testing till 7th grade. Now I make a point to tell parents that no matter where your kid falls on the milestone chart, ask one simple question at every parent-teacher conference: “What’s one thing my kid struggles with that I might not see at home?” That question takes 10 seconds to ask, and it keeps you from missing gaps just because your kid checked all the early boxes.
Don’t get me wrong, milestones aren’t useless. If your kid is 18 months and not walking at all, or 2 and not talking at all, that’s a clear sign to get them checked out, catch any issues early. But a few weeks late, a few months late, even six months late for one milestone when everything else is clicking? That’s just your kid’s timeline.
We found Lila’s cleats eventually, I dropped Jax at robotics, and stopped for Lila’s matcha latte on the way back. She’s still working on that essay; she’ll get it done when she’s ready, even if it takes longer than the kid in her class who finished it the first week of school. Jax won his regional robotics competition last month, even though people once worried he’d never talk well enough to present his project to a panel of judges.
I put the baby book back on the basement shelf when I got home. The checkmarks are still there, but they don’t mean half as much as the texts I get from Jax when he’s at practice asking for extra granola bars, or Lila begging me to watch her favorite show with her after she finishes a hard week of school. Milestones tell you when the average kid hits a skill. They don’t tell you who that kid is going to be.
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