Clothes that fit your littles,
and your conscience.
You blink and nothing fits anymore.
Don’t worry - we’ve got the Next Size Up covered.
How it Works
Step 1:
Tell us Your Child’s Size
Or enter their measurements in our Perfect Fit Calculator to make it even easier.
No need to guess, we know kids grow fast, and sizes aren’t one-size-fits-all.
Step 2:
We Build Your Bundle
Each item is parent-approved, and hand-selected with care.
Cleaned, curated and packaged with love — just like we’d do for our own kids.
Step 3:
Clothes That Feel Good
No fast-fashion guilt, overfilled laundry baskets, or last-minute scrambling.
Just clothing that keeps up with your little, budget, and values.
Why We’re Here
Millions of children’s clothes end up in landfills every year, while many families struggle to afford what they need.
Parents are often forced to choose between what’s sustainable and what’s actually affordable.
At Next Size Up, you don’t have to pick.
clothing items have entered U.S. landfills since May 1, 2025.
clothing items saved from landfills by Next Size Up — and counting.
Shop Our Bundles
Explore affordable, sustainable baby and toddler clothing bundles (NB–5T) designed for every stage and season. From monthly secondhand kids’ clothing subscriptions to seasonal sets and full wardrobe bundles, our curated collections help families shop eco-friendly, gently used clothes online with confidence and ease.
Stay ahead of every growth spurt. The Next Size Up Monthly Clothing Bundle includes 10+ gently used baby and toddler clothing items, carefully curated to fit your child’s current size and style. Ideal for busy parents, this subscription box ensures you always have the right size at the right time — without the waste or cost of buying new.
Each bundle is hand-selected for quality, comfort, and seasonality, making it a smart, sustainable choice for families looking to simplify wardrobe planning. Perfect for babies, toddlers, and young kids from newborn to 5T.
Clothe your child for the season without stress or overspending. The Next Size Up Seasonal Clothing Bundle includes 20+ gently used, seasonally appropriate clothing items for babies, toddlers, and young kids. Each piece is handpicked to fit your child's current size, personal style, and the weather ahead.
Say goodbye to last-minute shopping and overpriced fast fashion. This bundle makes it easy to keep your little one comfortable and stylish all season long - while saving money and supporting sustainability.
Everything your child needs, all in one bundle. The Next Size Up Full Wardrobe Bundle includes 40+ gently used baby and toddler clothing items carefully curated to match your child's current size, style, and daily needs.
From daycare to playdates, naptime to outings, this all-in-one clothing solution eliminates the need for constant shopping trips. Parents love the convenience, the savings, and the sustainable impact of choosing a zero-waste wardrobe refresh.
Perfect for new parents, growing families, and anyone looking for a high-quality, affordable, eco-friendly way to keep up with growth spurts.
Testimonials
At Next Size Up, we're parents, too — juggling messy meals, sudden growth spurts, and never-ending laundry. This business was born out of a real need: making clothing for fast-growing little ones more practical, more affordable and less wasteful.
Hi, I’m Mae — mom of 2 amazing kids, and founder of Next Size Up. I created this company to make shopping for children’s clothes more simple, sustainable, and affordable for every family.
We collect gently used baby and toddler clothes (Newborn-5T), sort and curate them into stylish, size-specific bundles, and deliver them to your door - making it easier to keep up with growth spurts without overspending or over-consuming.
But Next Size Up more than just a shop.
With every bundle sent and every bag of clothes passed on, we aim to:
✅ Make shopping by size - not guesswork - easy and reliable
✅ Extend the life of high-quality clothing already in circulation
✅ Cut down on textile waste and overconsumption
✅ Support families with more affordable access to essentials
✅ Create a cycle of care that grows with our kids and our values
We're proving that small actions (one outgrown shirt, one hand-packed bundle) can spark real change.
Because at Next Size Up, we believe every growth spurt is a chance to grow greener, give back, and do better. Together. 🌱
About Us
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