Phew! Had to put on my product developer hat for this one. Scrolling through baby sheet listings, you've probably noticed the same claim over and over: 800-thread count, 1,000-thread count, sometimes even higher. But does a bigger number actually mean a better sheet for your baby? 

Not when it comes to jersey cotton. Thread count is a measurement that’s more suitable for woven fabric, and jersey knit, the stretchy, T-shirt-like material most baby sheets are made from, isn't woven at all. Before getting in the biz, I didn’t know this either. 

I learned that you need a different set of numbers to measure quality. Here's what thread count actually is, why it may not apply to the sheets in your baby's crib or bassinet, and what to check instead.

What Does Thread Count Actually Mean?

Thread count refers to the number of horizontal and vertical threads woven into one square inch of fabric. The FTC's guidance on textile labeling exists partly because thread count claims have been misused for years, with some brands counting individual strands inside a twisted, multi-ply yarn to inflate the number on the label.

A Measurement Built for Woven Fabric

The official test method for thread count, ASTM D3775, only applies to woven fabric, meaning fabric made by interlacing lengthwise (warp) and crosswise (weft) threads on a loom, like percale or sateen sheets. It is not accurate for knit fabric.

Why Thread Count May Not Apply to Jersey Cotton Baby Sheets?

Jersey cotton, the fabric used in most fitted crib, bassinet, and playard sheets, is knit rather than woven. That single difference is why a thread count on a jersey sheet label isn't a real, standardized figure. To know more about Jersey Cotton vs Muslin vs Bamboo Baby Sheets, read here. 

Knit Construction vs Woven Construction

Woven fabric is built from two sets of threads crossing at right angles, which is what makes a thread count possible to measure in the first place. Knit fabric, on the other hand, is made from a single continuous yarn looped over itself again and again, the same construction used for a T-shirt. According to testing standards referenced by IDFL, knitted textiles are measured in wale and course loops, not warp and weft threads, so a thread count figure may not mean the same thing for them quality-wise. You can compare the fabrics yourself by looking at them closely under a bright light or magnification. 

What Should You Look for Instead of Thread Count?

Instead of thread count, these three other factors do a much better job of predicting how a jersey cotton sheet will actually feel and hold up.

GSM (Fabric Weight) Explained

GSM stands for grams per square meter, and it measures how much fabric is packed into a given area. For jersey cotton, a lighter GSM tends to feel thinner and more breathable, while a heavier GSM feels cozier and more substantial. Neither is automatically better. It comes down to what you want the sheet to do.

Knit Tightness and Cotton Quality

A tightly knit jersey resists pilling and holds its shape wash after wash, while a loosely knit one can stretch out or thin over time. The quality of the cotton fiber itself, including how long and fine the individual fibers are, also plays a bigger role in softness.

How Does GSM Affect Softness, Breathability, and Durability?

Lighter-weight jersey (on the lower end of the typical range) breathes well and suits warmer rooms or hot sleepers, but can feel thinner and wear out a little faster with frequent washing. Mid-to-heavier jersey feels more substantial and tends to hold its shape and softness longer, though it can run warmer. There's no single correct GSM for every nursery. It's a trade-off between breathability and durability, and the right choice depends on your climate and your baby's temperature preferences.

I remember having to choose a lower GSM fabric for my youngest, who naturally ran hotter than my older kids.  

Shopping Smarter Than the Number on the Label

A high thread count on a jersey sheet listing isn't exactly a red flag, but it isn't a meaningful quality signal either. Once you know to check GSM, knit tightness, and cotton quality instead, it gets a lot easier to tell a genuinely well-made sheet from one that's just leaning on a big number. If you'd rather skip the guesswork entirely, Joey + Joan's jersey cotton sheets are built around exactly those factors, not a marketing figure.

Frequently Asked Questions

Is a higher thread count always softer?

Not for jersey cotton. Since thread count doesn't apply to knit fabric, a high number on the label doesn't correlate with softness. GSM and knit tightness are much better predictors.

What GSM is considered good quality for baby crib sheets?

There's no single right answer. A mid-weight GSM tends to balance softness, breathability, and durability well for most nurseries, but the ideal weight depends on your climate and your baby's comfort.

Do jersey cotton sheets ever list a thread count?

Some brands still print one, but since jersey is knit rather than woven, that number isn't measured the way official thread count standards define it.

Is 100% cotton always better regardless of thread count?

Fiber content matters, but it's not the whole picture. The same cotton can feel very different depending on how it's knit and finished, so cotton content and construction quality both matter.

How can I judge sheet quality without relying on thread count?

Check the GSM if it's listed, feel for a tight, even knit with no visible gaps, and look for a fitted design with a snug, secure elastic edge.

Sources

1. Threading Your Way Through the Labeling Requirements Under the Textile and Wool Acts - FTC guidance addressing misleading thread count claims in textile labeling.

2. ASTM Textile Standards - Includes ASTM D3775, the standard test method for fabric count of woven fabric.

3. Thread Count ASTM Definitions - Independent textile testing lab explainer distinguishing woven thread count from knit fabric count.