Dec 09, 2025

A Deep Dive into Kate Quinn’s Sizing Guide: How to Find the Perfect Fit

When you fall in love with a Kate Quinn piece, you want it to fit perfectly. Whether you’re shopping for baby clothes, toddler outfits, or cozy family-matching sets, understanding how our sizing works helps every piece feel as comfortable as it looks.

This guide takes a closer look at Kate Quinn’s sizing philosophy. Learn how to measure accurately, how baby, toddler, and adult sizes compare, and how to choose the perfect fit for your growing family.

Why the Fit Matters for Every Age

The right fit is more than a number on a label — it’s about comfort, confidence, and care.
For babies, it means fewer irritations and better mobility during tummy time and play.

For kids, it’s the freedom to run, explore, and grow with ease.

For parents, it’s the comfort and confidence that come with beautifully designed, high-quality clothing that help the family create beautiful memories.

A good fit helps your baby feel more comfortable in their clothes, and also helps the pieces last longer and look better.

Explore our latest family-matching sets for high-quality and affordable clothing styles for every age.

Kate Quinn’s Inclusive Sizing Philosophy

Our mission is simple: everyone deserves comfortable clothing that’s also sustainable. That includes babies, kids, and parents alike.

Most pieces are true to size and follow standard U.S. measurements. Our signature organic cotton, bamboo, and modal fabrics offer soft handfeel and gentle movement, while unisex silhouettes ensure a universal, relaxed fit. Coordinated family matching outfits use the same eco-friendly fabrics, thoughtfully tailored for each age group, so a “Medium” in women’s loungewear feels just as perfectly crafted as a “6–12M” baby romper.

Understanding the Sizing Categories

Baby & Toddler Sizes

Our smallest sizes are designed for a comfortable feel, with room for diapers and layering. Below is a sizing chart that can help you from newborn to toddler sizes.

Label	Approx. Age	Height (in)	Weight (lbs)
NB	0–1 month	Up to 21″	Up to 8 lb
0–3 M	0–3 months	21–24″	8–12 lb
3–6 M	3–6 months	24–27″	12–17 lb
6–12 M	6–12 months	27–30″	17–22 lb
12–18 M	12–18 months	30–32″	22–27 lb
18–24 M	18–24 months	32–34″	27–30 lb
2T–4T	2–4 years	34–41″	30–40 lb

Kids & Youth Sizes

Slightly roomier for growth and playtime flexibility. Perfect for school days, weekends, and everything in between.

Label	Age	Height (in)	Weight (lbs)
5Y	5 years	41–44″	40–46 lb
6Y	6 years	44–47″	46–52 lb
7Y	7 years	47–50″	52–58 lb
8Y	8 years	50–53″	58–65 lb
10Y	9–10 years	53–56″	65–75 lb
12Y	11–12 years	56–59″	75–90 lb

Adult Sizes

Our women’s collection is designed with the same commitment to softness and sustainability. Relaxed yet flattering cuts make parenting, lounging, and daily wear effortlessly comfortable.

Adult sizes - Women

Size	Bust (in)	Waist (in)	Hips (in)
XS	31–33	24–26	34–36
S	33–35	26–28	36–38
M	35–37	28–30	38–40
L	37–39	30–33	40–43
XL	39–42	33–36	43–46
XXL	42–45	36–39	46–49

Adult sizes - Men

Size	Chest (in)	Waist (in)	Hips (in)
S	35–37	29–31	35–37
M	38–40	32–34	38–40
L	41–43	35–37	41–43
XL	44–46	38–40	44–46
XXL	47–49	41–43	47–49

Measuring for the Perfect Fit

Grab a flexible measuring tape and a few quiet minutes. For babies, measure the chest, waist, and height (from head crown to heel). For kids, include the inseam for leggings or pants. Adults can measure bust, waist, hips, and inseam, compared to the chart above, for best results.

Helpful reminder: Take measurements in inches. Most pieces are true to size. When we have special products, we add design fit notes in the product description. If you’re between sizes or shopping for growing littles, it’s okay to size up for longer wear.

Need help choosing the right fit? See Kate Quinn Size Guide.

Fabric & Fit: What to Expect with Kate Quinn

Because fabric matters, here’s how our materials feel and fit depending on what you are shopping for. Our clothing has options with a mix of fabrics from:

Organic Cotton — soft, breathable, and true to size with minimal shrinkage.

Bamboo — smooth, breathable, and drapey for easy movement.

Modal — super-soft, breathable, drapey fabric, similar to bamboo in feel and flow.

Each piece moves with you naturally, never restrictive, always gentle.

Sizing Tips for Different Kate Quinn Clothing Styles

Most styles run true to size; check the design fit notes for any special callouts. If you're between sizes (especially for fast-growing littles), sizing up is a safe bet. Dresses generally fit as expected. Leggings and pants are cut for everyday movement, so use your usual size and check the inseam and growth room for kids.

Rompers and jumpsuits typically fit your regular size, with torso-length notes to help you make the perfect pick. Tops and tees have easy, layer-friendly silhouettes. Footies are offered for only 6–9 months old, in line with strict safety regulations. Sleepwear is purposefully close-fitting to meet CPSIA guidelines for safer sleep. Outerwear is designed to accommodate layers; see the design fit notes for any style-specific adjustments.

Growing with Your Family

Growth happens fast. Keep a size up on hand for little ones. Fabrics like bamboo and modal move beautifully; however, organic cotton jersey and some wovens have limited stretch, so follow body measurements and consider sizing up if between sizes. For adults, stick to your size for a polished fit, or size up for an extra-relaxed feel, especially in loungewear.

Sustainability Meets Fit

Proper fit helps clothing last longer, reduces returns and waste, and encourages hand-me-downs and reuse within families. Choosing the right size is one small, mindful act that supports both your family and the planet.

Shop with Confidence

See Kate Quinn’s clothing sizing chart, which includes detailed size charts and fit notes. If you love mixing relaxed tops with fitted bottoms, you can easily blend sizes across your cart.

Matching Clothing Options for the Whole Family

One of our favorite parts of designing is seeing families coordinate their looks together. From baby rompers to family-matching lounge sets, you’ll find matching prints, colors, and fabrics across every age range for the baby and for the parents. Perfect for family photos, holidays, or cozy days at home. Explore our family matching collections and create memories in comfort and style.

Caring & Washing for Your Perfect Kate Quinn Clothing Fit

Keep your favorite pieces soft and true to size with mindful care. Wash in cold water with a gentle detergent; avoid bleach or fabric softeners, and tumble dry on low or air dry. Store flat or folded, and steam lightly to refresh your garments. Good care preserves both the fabric's integrity and your perfect fit, so your Kate Quinn favorites stay beautifully loved for years to come.

During packaging and shipping, our products are steamed and folded. Lines or indents from folding should disappear after the first wash. The instructions below provide general care. Guidance: always check the garment's inside label for the most accurate instructions.

Turn the garment inside out to wash and dry.
Normal wash cycle at cold water (30°C / 65°F–85°F).
Use mild laundry soap (non-toxic, biodegradable preferred).
Fabric softener is not advised.
Do not use bleach; it will fade colors and weaken fibers.
Remove garments immediately after the wash cycle.
Tumble dry low heat (55°C / 125°F) if desired.
Expect garment shrinkage: 3–5%.
Wash like fabrics together for the best results.

Find the Perfect Fit with Kate Quinn Clothing

Measure before ordering, trust our size charts, and consider the stretch and feel of each fabric. Every Kate Quinn piece is beautifully made for the moments that matter, thoughtfully crafted for you and your family. If you need help finding the perfect fit for your little one and yourself, please feel free to reach out to hello@katequinn.com.