Anton Koivisto, a Finnish entrepreneur and parent, started building Outgrow in early 2026 after realising there was no reliable way to know how a specific brand's sizing would fit his child — and no tool to track what was already in the wardrobe or predict when it would be outgrown.
What started as a personal project became a platform used by parents across the UK, US, and beyond.
What we do
tryoutgrow.com publishes verified size guides for 30+ major kids clothing brands including H&M, Zara, Tu Sainsbury's, Next, Marks & Spencer, George at Asda, Cat & Jack, Old Navy and more.
Our interactive size finder takes your child's measurements and returns a personalised size recommendation — not just a generic size chart, but the right size for your specific child in that specific brand.
Every size guide is built from verified official brand data and real parent fit feedback, not scraped estimates or guesswork.
The Outgrow app
Beyond the website, Outgrow is a free iOS and Android app that helps parents manage their child's entire wardrobe. Add clothing items, track how long each piece fits, get alerts before clothes are outgrown, and share the wardrobe with a co-parent.
The goal is simple: never buy the wrong size again, and never find an outgrown item with the tags still on.
Kids Size Finder
Kids Size Finder is our standalone size recommendation app — a quick, simple tool that saves your child's measurements and gives instant size recommendations across every brand, every time.
Our approach to data
We take sizing data seriously. Every brand size chart on this site is verified against official brand sources. Where we have real parent fit feedback, we use it to improve our predictions. We use statistical modelling to identify which brands run large, small, or inconsistently across sizes.
We never publish data we can't verify.
Who we are
Outgrow Solutions Oy is a Finnish technology company founded in 2026. We're a small team building tools that make one small but genuinely annoying part of parenting a little easier.
Written and verified by Anton Koivisto, Founder of Outgrow Solutions Oy.