Youth Softball Uniforms Sizing Guide | Fit That Plays

For the full breakdown, see our best Youth Softball Uniforms guide.

Youth softball uniforms fit loosely by design, and each brand pours its own numbers into those YXS-to-YXL labels. The fix is a cloth tape measure, a child in light clothing, and this sequence of where to measure — because league rules, shrinkage, and the gap between body size and garment size all change which label you pick.

Measuring Your Athlete: The Four Numbers That Decide

Take every measurement over undergarments or thin clothing with the tape parallel to the floor. Write each down as a raw body size — the uniform will add inches later.

• Chest/Bust: Measure around the fullest part with arms relaxed at the sides. For girls, measure over a sports bra with little to no padding.
• Waist: Find the narrowest part — where the body bends side to side — and keep the tape horizontal. Do not measure over bulky layers.
• Seat/Hips: Stand with heels together and measure the fullest part of the hips, roughly 7–9 inches below the natural waist.
• Inseam: Measure from the crotch seam straight down to the floor (no shoes). Some brands specify “to the ankle bone” — check the chart before ordering.

For jersey length, run the tape from about one inch below the neck down the back to where the shirt should end — usually mid-hip for a tuckable fit.

Major Brand Charts: Under Armour, Rawlings, BoomBah

Each brand uses its own measurement grid. The trade-off is always between loose athletic fit and league compliance — most youth leagues at ages 10+ require the shirt to stay tucked, which means sizing up when you’re between labels.

When a child falls between two sizes, go up for a looser game fit or down for a slimmer silhouette. Manufacturers typically add 2–4 inches to the raw body measurement when sewing the final garment, so the jersey’s actual chest will read larger than the chart suggests.

Four Mistakes That Send Parents Back to the Store

Knowing the pitfalls saves a return shipment and a disappointed player.

• Relying on streetwear size instead of body measurements. A child in a “size 10” t-shirt might hit Youth Medium in one brand and Youth Large in another. The tape measure is the only truth.
• Ignoring the tuck requirement. Leagues for players 10 and older almost always require shirts tucked into pants. A jersey that barely reaches the waistband on day one will pull out by the second inning after the first wash.
• Confusing “Fits Size” with age. A six-year-old can wear YM if her measurements say so.
• Skipping the shrinkage buffer. Most youth uniforms will shrink slightly over a season. Ordering the exact snug fit now often leads to a mid-season uniform that rides up and needs replacement.

FAQs

What if my child’s measurements fall between two uniform sizes?

Choose the larger size for a looser athletic fit and better coverage. Uniforms are designed with a 2–4 inch loose-fit tolerance, so the larger size will still look intentional and stay tucked more reliably after washing.

Do girls’ and boys’ youth softball uniforms use the same chart?

Not always. Rawlings, for example, publishes separate pants sizing for girls’ softball models with narrower waists and shorter inseams. Always check the gender-specific chart before ordering, especially for pants and fitted jerseys.

Can I use my child’s age instead of measurements?

No. Grade-based labels (YXS, YS, YM) correlate to body measurements, not age. A 10-year-old who is tall for her grade may wear a Youth Large. Using age alone will almost certainly produce the wrong fit.