The fastest way to tell if your kids are in the correct size shoes is to have them stand up, then press your thumb at the end of the shoe: you want roughly a thumb's width of space between the longest toe and the front, with no part of the foot pressing against the sides. Kids grow in bursts, they rarely complain, and the pair that fit in March can be done by June. A two minute check every couple of months saves a lot of sore feet.
How to check kids shoe size at home
Do the check the same way each time, with the child standing. A foot spreads and lengthens under body weight, so a shoe that feels roomy while sitting can be tight by the end of a walk to school.
- Have them stand with weight on both feet, wearing the socks they normally wear with that shoe.
- Press down at the very front of the shoe and feel for the longest toe. That toe is not always the big toe.
- Aim for about a thumb's width of space ahead of it, which is roughly a finger's width for a smaller child.
- Run your thumb along both sides of the forefoot. The foot should sit inside the shoe, not spill over the footbed or press the upper outward.
- Check both feet. One is usually a little longer, and you fit the larger one.
- Check at the end of the day, when feet have swollen slightly, rather than first thing in the morning.
How often to check, and why growth catches parents out
Younger feet change fastest. For toddlers and preschoolers, a check every two months is about right. From early elementary through middle school, every three months works well. Teenagers can go through a growth spurt in a single term, so if a kid suddenly outgrows jeans, check the shoes in the same week.
Kids also adapt quietly. They curl their toes, walk on the outside of the shoe, or stop wanting to wear that pair, and none of that arrives as a clear complaint. Holes worn through the upper near the big toe, red marks after school, blisters, and socks that tear at the toe are all size signals.
What happens when kids shoes are too small
A shoe that is too short or too narrow keeps the front of the foot from spreading the way it wants to when the child lands. Over years, poor fit is often mentioned alongside problems people carry into adulthood, including bunions, hammer toe and plantar fasciitis. We cannot diagnose any of that, and if your child has pain that keeps coming back, that is a conversation for a doctor or podiatrist. What we can do is make sure the shoe is not making it worse.
Width is the half of the problem that gets missed. If the forefoot presses outward against the sides, a longer shoe rarely fixes it. Ask for a wider option in the same size instead.
Support and build quality matter for youth shoes too
Kids shoes vary hugely in how they are made. We believe youth shoes should be built with the same level of materials and quality as high end adult shoes, because a child on a playground is putting through plenty of miles of their own. That is a real difference from what turns up in big box aisles, and it shows after a few months.
Support type matters as well. Youth shoes, like adult shoes, are built differently depending on whether a foot rolls inward or outward through the stride. We match the shoe to your child's foot shape and to their natural walking and running gait, rather than handing over whatever is stacked in their size. That is the same free fitting process we use with adults, done at a pace kids can handle.
Youth fitting at Fitness Sports
Fitness Sports has been fitting the Iowa community for more than 40 years, and youth fitting is part of that. Bring your child to any of our seven stores and the fitting is free, with no appointment needed. We measure both feet for length and width, look at arch height, watch them walk, and check growing room with them standing. If the pair does not work out at home, bring it back within 30 days with the receipt for a refit, an exchange or a refund.
We also carry the widest selection of youth track spikes in Iowa, in sizes 1 to 4 and up, so a middle school athlete is not waiting on a shipment mid season. Browse the youth and adult track spikes we stock, or get measured before the season starts.
Questions we get asked
How much growing room should kids shoes have?
About a thumb's width between the longest toe and the end of the shoe, measured with your child standing. Much less than that and they will be out of the shoe within weeks. Much more and the foot slides forward as they run, which causes blisters and makes the shoe feel unstable. Width should be right on the day, with no extra allowance built in.
How often should I check my child's shoe size?
Every two months for toddlers and preschoolers, every three months or so through elementary and middle school, and at the start of any sports season. Add a check any time you notice a growth spurt elsewhere, since feet tend to move at the same time. The check takes two minutes at home, and we are happy to measure at the store for free.
Should I buy a size up so the shoes last longer?
A little growing room is good, a lot is not. In a shoe that is too long, the foot slides forward on every step, the flex point of the shoe sits in the wrong place under the foot, and the heel slips. Kids then lace tightly to compensate. Aim for the thumb's width and plan to replace the pair rather than stretching one season into two.
Can my younger child wear hand me down shoes?
Sometimes, but check them the way you would check a new pair. Look at how the midsole has compressed, whether the shoe leans to one side when you set it on a table, and whether the tread is worn unevenly. A shoe that has been molded by another child's stride and mileage may not give your younger one much support left to work with.
What size do youth track spikes start at?
Our youth spikes start at sizes 1 to 4 and go up from there, which covers most middle school athletes and a good number of younger high schoolers. Bring the event with you when you come in, since sprint, distance and cross country spikes are built differently. We will fit the spike snugly, with less growing room than a training shoe.
If you are not sure whether your child is in the right size, bring them in and we will measure for free at any Fitness Sports store in Iowa. It takes a few minutes and there is no pressure to buy.