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How To: Sizing Kid's Clothing

June 21, 2023

How to select sizing on Hand Me Up!


Our kids are always growing…it’s not always easy to know exactly how to figure out their current size. Honestly, why does it have to be SO HARD?


Sizing is generally based on age and size in the US, so you’ll see sizing like 0-3 months or 2T (~2 years). Clothing for kiddos, especially toddlers, is notoriously difficult to get correct. 


Different brands use different guides, so the Hand Me Up team has worked hard for you!!!! (It takes a village!)  


Use our sizing chart below to figure out what size you should choose for your order for your kiddo:


Age or the current size:

Recommended Hand Me Up Sizing:



Newborn - 2 months

0-3 months

3 months - 5 months

3-6 months

6 months - 11 months

6-12 months

12 months - 23 months

12-24 months

In between sizes

24 months (still in diapers)

Size 24 pants have a curvier bottom for extra diaper room.

12-24 months

2 years (no longer in diapers)


Toddler sizing 

3T (3 years)


4T or extra small (4 years)


5T or extra small (5 years) 


6T or small (6 years) 



Hand Me Up Tip! 


Buying second-hand is a bit different than buying new. You’ll want to follow our size chart to ensure you don’t receive an item that is too small. 


Return policy: We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. 


Whether this is your first time buying secondhand or if you’ve been doing it for years, we hope this information helps you get ready for your Hand Me Up bag!


Additionally, here is an app that will help you do a quick measurement of your kiddo: Smart Measure on Apple or Android


Last Option


If you have the time and a very patient kid, you can measure using a measuring tape:


1. Height: Have your child stand with their back against a wall and use the measuring tape to measure from the floor to the top of their head.


2. Chest: Wrap the measuring tape around their chest, just below their armpits. Make sure the tape is snug but not too tight.


3.Waist: Wrap the measuring tape around their waist, just above their belly button. Again, make sure the tape is snug but not too tight.


4. Hips: Wrap the measuring tape around the widest part of their hips, below their waist.


5. Inseam: Find a pair of pants that currently fit your kiddo, and measure from the crotch to the cuff on the inside seam of the leg. 

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