The Honest Truth About Nike Baby Clothes and Sizing

When I was pregnant with my first, I got sat down at my own baby shower and given three entirely different lectures on how to dress a newborn. My mom, bless her heart, insisted babies only need those white cotton sack things that look like tiny potato bags, because that’s what we wore in 1991. My mother-in-law, who lives for a photo op, gifted us a sixty-dollar neon tracksuit and said he needed to look sharp for visitors. Then my best friend pulled me aside and swore I needed moisture-wicking athletic gear because her kid sweated like a grown man in the Texas heat and regular cotton just stayed wet all day.

I’m just gonna be real with you, I sat there staring at a tiny shoe box and a pile of tiny sportswear, completely overwhelmed. When you start looking at athletic brands for infants, you suddenly feel like you’re outfitting a miniature Olympian instead of a six-pound potato who mostly just spits up and sleeps. But after three kids, a whole lot of trial and error, and trying to stuff a chunky toddler into a pair of fleece joggers while he actively fought me, I’ve learned a few things about what actually works.

The whole sizing situation is a mess

I could talk about this for an hour, but if you take nothing else away from me today, hear this: the month ranges on the tags are complete works of fiction. You have to buy baby clothes by weight and height, especially when you start looking at the sporty stuff.

My oldest son is my cautionary tale for pretty much everything, and sizing is no exception. I remember trying to wrestle him into a three-to-six-month athletic onesie when he was exactly four months old. He looked like a sausage casing about to pop. Athletic brands generally run a little slim and streamlined anyway, because they’re copying the adult activewear look. If you look at their actual size charts hidden deep on the internet, you'll see a zero-to-three-month size is for a baby up to fourteen and a half pounds. Well, my middle kid hit fifteen pounds before he was two months old, so he was sized out of that bracket before we even got the tags off.

I basically learned to just ignore the age on the hanger entirely and size up if I was even slightly in doubt, because nobody has the patience to peel a tight, non-stretchy polyester blend off a screaming infant.

Sweaty babies and the whole temperature thing

Living in rural Texas means heat is just a personality trait of our environment. I used to think all that high-tech fabric stuff was just a marketing gimmick to get parents to spend more money, but there's actually a little bit of method to the madness.

My doctor, Dr. Evans, mumbled something to me once about how babies can't keep stable their body temperature very well at all, and that overheating is apparently a big risk factor for some of the scary sleep stuff. He basically told me to dress them in whatever I was wearing, plus maybe one light layer. The problem is, when you strap a kid into a massive plastic car seat in August, they turn into little furnaces.

I guess the Dri-FIT technology they use in some of the Nike baby stuff actually does pull the sweat away from their skin, which is nice when you pull them out of the car seat and they aren't completely damp. But I’m also not putting my kid in synthetic fabrics twenty-four seven. When we're just hanging out at the house or when they’re sleeping, I'm a hardcore believer in natural fibers that just let the skin breathe without all the laboratory engineering.

For those super hot days when we're mostly indoors or in the shade, I usually default to the Organic Cotton Baby Bodysuit Sleeveless Infant Onesie. It’s 95% organic cotton, so it doesn't give my youngest those weird little red heat rash bumps on her chest that synthetic blends sometimes cause. It’s got just a tiny bit of stretch, which makes it easy to pull over her giant head without a meltdown. It’s simple, it works, and I don't have to worry about weird dyes sitting against her skin all day.

My absolute favorite thing for chilly mornings

Now, when the weather finally does cool down here—which is basically just a two-week period in January—the game changes completely. You want them warm, but you also need to be able to change a blowout in the back of a minivan at a moment's notice.

I’ve bought a lot of expensive fleece outfits over the years, and honestly, most of them just frustrate me because they're too bulky or the zippers get stuck under the baby's chin. My actual holy grail outfit for cooler weather isn't even a track suit. It's the Organic Baby Romper Long Sleeve Henley Winter Bodysuit from Kianao. I'm obsessed with this thing.

First of all, the organic cotton is ridiculously soft—like, the kind of soft that makes you wish they made it in adult sizes. It has these three little buttons at the top that look super cute but are seriously functional because you can open up the neck wide enough to pull it down over their shoulders if a diaper situation goes completely sideways. I used to put my oldest in those stiff hoodies, and he would just scream anytime I had to pull it over his ears. This henley romper just stretches right over, keeps his arms warm, and washes beautifully. I've washed the gray one probably forty times and it hasn't pillowed or shrunk up weirdly in the arms.

If you're building a wardrobe and trying to figure out what to really spend your money on, I highly suggest checking out a good solid collection of natural organic baby clothes that can handle endless washing without falling apart.

The honest truth about baby tracksuits and money

Let's talk about the budget for a second, because spending fifty or sixty bucks on a tiny jacket and pants that they'll wear for exactly three months makes my eye twitch. I run a small Etsy shop and have three kids in diapers and pull-ups right now, so every dollar has to work pretty hard around here.

I'll say this: the premium athletic gear does hold up really well. The stitching is solid, and I guess their Move to Zero stuff uses recycled polyester, which makes me feel a tiny bit better about the environmental impact. If you buy a nice gender-neutral set, you can absolutely hand it down through multiple kids. My youngest is currently wearing a gray fleece zip-up that her two older brothers lived in, and the zipper still works perfectly.

But if you don't have multiple kids to hand it down to, or if you aren't buying it as a gift? Skip the expensive sets and just buy basic separates. The little rompers and runsies are usually around thirty bucks and are way easier to deal with than matching pants and jackets anyway.

An outfit that's just fine but not magic

Speaking of things that are just okay, I should probably mention the Short Sleeve Organic Cotton Baby Bodysuit Ribbed Infant Onesie. I bought this thinking the ribbed texture would be really cute, and it's fine. It’s exactly what it says it's—a ribbed bodysuit.

The organic cotton is definitely nice, and I appreciate that the contrast trim doesn't scratch my daughter's thighs. But honestly? The snap closures feel a little bit smaller than the ones on the henley romper, and when I'm trying to snap a wriggling nine-month-old back together in the dark at 2 AM, I want big, chunky snaps that I can find by touch alone. It's a perfectly decent piece of clothing, and it holds its shape in the wash, but it doesn't give me that "oh my gosh I love this" feeling like the long sleeve henley does. It’s just a solid, average backup outfit that lives in the middle of the drawer.

Car seats and puffy coats

This is probably the one area where I think the premium athletic brands seriously make a lot of sense, strictly from a safety standpoint.

I read an article years ago that absolutely terrified me about how puffy winter coats are incredibly dangerous in car seats. The fluff compresses in an accident, meaning the straps are really way too loose to hold the baby. Dr. Evans basically confirmed it and said we should only be using thin, warm layers in the car.

This is where something like Tech Fleece genuinely shines. It’s incredibly thin, so it doesn't mess with the car seat straps at all, but it holds heat really well. I refused to pay retail for it, so I stalked a resale app until I found a gently used one for twenty bucks. It was the best twenty dollars I spent that winter. We could buckle him in tight, keep him warm on the frozen walk to the car, and I didn't have to constantly strip off a giant marshmallow coat every time we got in and out of the vehicle.

So, do you need a drawer full of athletic logos for a baby? Absolutely not. Half the time my kids are running around in just a diaper and a soft cotton tee anyway. But if you're smart about what pieces you buy, understand that the sizing is basically made up, and mix those sporty layers with some high-quality organic cotton for when they honestly need to sleep and breathe, you'll survive the first year just fine.

If you're ready to grab some pieces that will really last through the spit-up phase without irritating your kid's skin, explore our collection of baby clothes and find something that honestly makes your life easier.

Questions I hear all the time

Are Nike baby clothes true to size?

Honestly, no, not in my experience. They tend to run long and skinny, kind of like an athletic fit for a grown-up, which is hilarious because babies are basically shaped like frogs. Always look at the weight chart instead of the months on the tag, and if your kid has chunky thighs, just do yourself a favor and size up.

Is Dri-FIT fabric safe for newborn skin?

My doctor wasn't terribly worried about it, but he did mention that newborns have incredibly thin, sensitive skin. I personally wait until they're a few months old before putting them in the synthetic athletic stuff. For those first few weeks, I stick purely to organic cotton because it's softer and I just don't trust the chemical treatments on performance wear against a fresh baby.

Can babies sleep in their tracksuits?

I wouldn't. The AAP and every mom group on the internet will tell you not to overdress a sleeping baby. Those fleece suits and heavy joggers are meant for being outside in the cold. For sleep, you just want a breathable cotton layer so they don't wake up sweating and screaming at 3 AM. Trust me on that one.

How do you wash the expensive baby activewear?

I treat it like I treat my own workout leggings. Wash on cold, don't use fabric softener because it ruins the moisture-wicking stuff, and try not to blast it in the dryer on high heat. If you bake it in the dryer, the polyester blends tend to pill up and look terrible after about a month.

Is the Move to Zero stuff honestly better for them?

It's better for the planet since they use recycled materials, which is cool, but it's still recycled plastic honestly. If you've a baby with severe eczema or something, you still might want to stick to natural fibers like organic cotton or bamboo for the layers that really touch their skin directly.