The jt3 "Combed Cotton" Baby Envelope Short Sleeve One-Piece

Silky Combed Cotton Softness. Ergonomic Infant Architecture.

Uncompromising garment authority for infants demands ultra-soft fiber purity, side-seamed stability, and effortless utility. The jt3 Baby "Combed Cotton" Envelope Short Sleeve One-Piece is engineered from a lightweight 3.9 oz/yd² (132.2 g/m²) 100% ring-spun combed cotton matrix (Heather variants feature a 52/48 ring-spun cotton-poly blend). Designed with an elasticized envelope neckline for easy over-the-head dressing, this bodysuit features side-seamed structural tailoring and a reinforced three-snap bottom enclosure for rapid diaper changes.

• 3.9 oz Combed Ring-Spun Cotton: Woven from long-staple ring-spun combed cotton to remove impurities, producing an exceptionally smooth, lightweight canvas with a gentle feel against delicate skin.
• Expandable Envelope Neckline: Engineered with overlapping shoulder lap joints that expand smoothly for quick, stress-free dressing and downward removal.
• Side-Seamed Structural Construction: Built with tailored side seams that preserve the garment's anatomical shape and prevent torquing or twisting after repeated washings.
• Reinforced Three-Snap Leg Closure: Outfitted at the crotch with heavy-duty tonal snaps anchored in reinforced trim for fast, secure diaper access.
• Breathable Thermal Regulation: Formulated with a light, high-density knit that offers soft skin comfort without overheating during daily active wear.

Find Your Perfect Fit

Infant Architecture. Comfortable Contour Fit.

This short sleeve one-piece features an anatomical fit designed with flexible chest width and seat room to fit comfortably over cloth or disposable diapers.

• Fit Profile: True to size for a classic, easy-wearing infant fit. Size up if additional room for growth or heavier diaper layering is preferred.

Product Measurements

To ensure a flawless fit, lay a favorite baby bodysuit flat on a hard surface and compare its measurements to the chart below.

A Body Length 

Measure from the highest point of the shoulder seam next to the collar down to the snapped bottom hem.

B Body Width

Measure across the chest 1″ below the armhole seams from side seam to side seam.

Size Chart