Back-to-school shopping has a timing trap: buy too early and your child may outgrow the size before the first day; buy too late and you're stuck with picked-over stock and shipping delays.

The Sweet Spot: 4–6 Weeks Before Term Starts

Buying within 4-6 weeks of the school year starting balances selection availability against the risk of a growth spurt making your purchase obsolete before it's even worn. For fast-growing kids, lean toward the closer end of that window.

Uniforms: A Modest Size-Up Is Standard Practice

Since uniforms are typically worn for a full school year, many parents size up by one size from current measurements to account for expected growth — particularly for shirts and trousers, which are easier to adjust (rolled cuffs, belts) than shoes.

Shoes Need the Most Frequent Re-Measuring

Unlike clothing, shoes don't have the same forgiving fit range — see our shoe size conversion guide for accurate measurement. Re-measure foot length at the very start of the shopping window, not months ahead, since feet can grow noticeably even over a summer break.

General Clothing Sizing

For everyday school clothes beyond the uniform, our kids' clothing size guide by age breaks down height and weight ranges that are more reliable than age alone — especially useful for back-to-school since growth over summer break can be significant.

🎒 Update sizes once a term, not once a yearKeep each child's current height, weight, clothing, and shoe size in a Size Notes profile, and update it at the start of each school term. It takes a minute and prevents an entire wardrobe of clothes that don't fit by Halloween.

The Bottom Line

Time your back-to-school shopping close to the actual start date, size uniforms up modestly for the year ahead, and re-measure shoes right before buying rather than relying on last term's size.