How to Choose the Right Pajama Size for Kids Ages 6-7? | Measure, Don’t Guess

Buy by height, chest, waist, and hip measurements rather than age, because a 6- to 7-year-old can land in a size 6, 6/7, 7, or even 7/8 depending on the brand.

A pajama label reading “6” from one brand can fit like a “7” from another. The reliable move is to measure the child, match those numbers to the brand’s own chart, and confirm whether the set is sold as tight-fitting or loose. This guide covers how to measure, how the big-box charts break down, and the safety rule that decides which fit to buy.

How Do You Measure a Child for Pajamas?

Measure height, chest, waist, and hip, then compare those numbers to the brand’s size chart rather than the age on the tag. Sleepwear charts are built around body measurements, not birthdays.

• Height: Stand the child against a wall, heels together, and measure to the top of the head. This is the most useful number for kids sleepwear.
• Chest: Wrap the tape around the fullest part of the chest, keeping it level under the arms.
• Waist: Measure at the natural waistline, the narrowest point above the hips.
• Hip: Measure around the fullest part of the seat.

Ages 6–7 often fall right at a size boundary, so a half-inch difference can tip the decision. Measure in whatever the child normally sleeps in, keep the tape snug but not tight, and write the numbers down before you shop.

What Sizes Actually Match Ages 6-7?

Matches vary by brand, and labels are not standardized. Target’s kids sleepwear chart lists S as size 6 for 47–49.5 inches of height and S as size 7 for 49.5–52.5 inches; the boys pajama chart lists S as 6/7 at a 25.5-inch chest, 23.5-inch waist, and 27-inch hips.

That means the same child can be a 6, a 6/7, a 7, or a 7/8 depending on the maker and whether the item is pajamas, loungewear, or a tight-fitting set. The table below lays out the Target reference points.

If your child measures between two rows, size up for loose sets and stay true to the chart for snug ones. Once measurements are locked in, a tested shortlist of 6 7 pajamas worth buying saves a lot of chart-crossing.

Tight-Fitting or Loose: Which One Should You Buy?

Check the label to see whether the set is tight-fitting or flame-resistant loose-fitting, because US rules treat them as two different categories. The Consumer Product Safety Commission states that children’s sleepwear regulations cover sizes above 9 months up to 6X and sizes 7 through 14, and tight-fitting sleepwear must meet regulatory measurement limits and labeling rules.

Snug-fitting sleepwear must stay within maximum dimensions at the chest, waist, seat, upper arm, thigh, wrist, and ankle, and it carries a permanent size label plus a hang tag warning that the garment is not flame-resistant and should be worn snug because loose garments catch fire more easily.

The practical fork: a tight-fitting set must fit close to the body to work as designed, so buy the size your measurements point to rather than sizing up. A loose flame-resistant set has more room to grow into. Health Canada’s sleepwear guidance covers the same tight-versus-loose distinction, which is why the tag matters as much as the size number.

What Mistakes Send Parents Back to the Store?

The two repeat offenders are buying by age label alone and ignoring the fit category. Brand charts differ enough that age tells you almost nothing on its own. Also watch the fabric and trim: tight-fitting sleepwear is required to taper appropriately and avoid certain trims, so a set that looks loose and roomy may not be compliant snug wear. If a pajama feels baggy but the tag says tight-fitting, it is the wrong size. Grab the tape measure, check the chart for that specific brand, and read the hang tag before checkout — those three steps cover nearly every sizing miss.

The CPSC’s guidance on tight-fitting sleepwear requirements spells out the measurement and labeling rules in full.