Choosing underwear for infants and children means evaluating much more than just the size. The fabric remains in contact with the skin for many hours, while bodysuits, t-shirts, briefs, and boxers must accommodate movement without being stiff or uncomfortable.
In the first few months, ease of changing and practicality of dressing are paramount. As they grow, freedom of movement, fit, and the garment's ability to adapt to daily activities become increasingly important.
In this guide, we will look at which aspects to consider when choosing baby underwear, when to prefer a bodysuit with or without sleeves, and how to navigate sizes, materials, and styles from the first months up to 6 years of age.
How to choose underwear for infants and children
Good children's underwear should be soft, flexible, and easy to wear. It doesn't necessarily need a complex structure: often, it's the essential lines, practical openings, and body-hugging fabrics that make the garment most suitable for daily use.
Before purchasing, it's useful to observe some fundamental elements:
- fabric composition and softness;
- fit appropriate for body shape;
- freedom of movement;
- practicality during changing;
- type of opening and closure;
- quality of seams and finishes;
- washing instructions on the label.
The age indicated on the size tag is a useful reference but not always sufficient. Two children of the same age can have different heights and body shapes. Therefore, when possible, it is better to compare body measurements and the indications provided in the size guide.
What material to choose for baby underwear?
The material is one of the first aspects to consider because underwear is worn directly on the skin. The fabric should feel pleasant to the touch, not excessively stiff, and capable of accommodating daily movements.
In addition to the main fiber, it's important to check the entire composition. A small percentage of elastic fiber can improve the garment's ability to stretch and recover its shape, contributing to a more flexible fit.
What is bi-elastic bamboo?
The bi-elastic bamboo used in the MySanity Baby line is composed of 90% bamboo and 10% elastane. The presence of elastane allows the fabric to stretch in multiple directions, following the body's shape more naturally.
The term "bi-elastic" does not indicate a one-size-fits-all, but a more flexible structure compared to a rigid fabric. The garment can thus better adapt to movements and small body changes during growth.
To learn more about the fibers used in the collections, you can consult the page dedicated to materials used by MySanity.
Baby bodysuit: what is it for and until when should it be used?
The bodysuit is one of the most commonly used garments during the first months because it stays in place and covers the torso even when the child moves. The snap closure at the bottom facilitates diaper changing and allows the garment to be opened without having to take it off completely.
There isn't a single age for everyone to stop using it. The choice depends on the child's comfort, diaper use, the season, and family habits. In many cases, the bodysuit remains practical up to 24 or 36 months.
Bodysuit with American neckline
The American neckline features overlapping flaps on the shoulders. This construction makes the neck opening wider and facilitates head passage during dressing.
The MySanity Baby bi-elastic bamboo short-sleeve baby bodysuit combines the American neckline with snap button closure at the bottom, offering a practical solution for daily use.
Short-sleeve or sleeveless bodysuit?
The choice between a short-sleeve and a sleeveless bodysuit mainly depends on the season, room temperature, and other garments worn over it.
When to choose the short-sleeve bodysuit
The short-sleeve bodysuit offers more coverage on the shoulders and can be worn alone in mild weather or as a first layer under shirts, rompers, and other garments.
It is a versatile choice for everyday wear, especially when a garment that covers the torso without long sleeves is desired.
When to choose the sleeveless bodysuit
The sleeveless bodysuit is particularly lightweight and leaves the arms completely free. It can be used in warmer periods or under other garments when avoiding multiple sleeve layers.
The MySanity Baby bi-elastic bamboo sleeveless baby bodysuit is an essential solution for the first few months and is available, like the short-sleeve model, up to 36 months.
The choice should not depend solely on the season indicated on the calendar. It is always advisable to consider the actual ambient temperature and check that the child is not dressed too heavily or lightly.
How to choose the size of a baby bodysuit
Bodysuit sizes are often presented in months, but age is only an indicative guide. To choose more precisely, it is useful to primarily consider the child's height and, when available, compare it with the manufacturer's size chart.
A bodysuit that is too small can pull at the bottom closure, restrict movement, or be short on the torso. An excessively large model, on the other hand, can create folds and not stay in place correctly.
Signs that may indicate the need to move to the next size include:
- snaps that are difficult to close;
- fabric that is very tight on the torso;
- obvious marks at the openings;
- shoulders or crotch pulling;
- less free movement than usual.
MySanity Baby bodysuits are available in sizes 0–6, 6–12, 12–18, 18–24, and 36 months. The bi-elastic structure offers a flexible fit, but the size should still be chosen based on individual body shape.
When to transition from bodysuit to t-shirt and briefs
The transition from a bodysuit to separate T-shirt and briefs doesn't necessarily happen at the same age for everyone. It can coincide with toilet training, starting kindergarten, or simply greater independence in dressing.
T-shirts and briefs are often easier for children to pull down and up independently. This makes them suitable for accompanying the child during potty training and daily activities where they start to dress themselves.
It is useful to choose models that are:
- easy to put on;
- sufficiently elastic;
- not too tight at the waist;
- free of rigid or bulky elements;
- suitable for accommodating movement.
Underwear for children aged 2 to 6 years
Between 2 and 6 years old, children progressively become more active and independent. Underwear must therefore accommodate running, playing, resting, and school activities without constantly shifting or causing discomfort.
The MySanity Baby line dedicated to this age group includes short and long-sleeve T-shirts, girls' briefs, boys' briefs, and unisex boxers in sizes 2–3, 4–5, and 6 years.
Short-sleeve T-shirt
The short-sleeve T-shirt is a versatile garment that can be used as underwear under other clothes or as a light T-shirt on milder days.
A simple design and a non-rigid fit help the garment follow the torso without hindering arm movements.
Long-sleeve T-shirt
The long-sleeve T-shirt is useful in cooler weather and during transitional seasons. The MySanity Baby model features an opening on the shoulder with snap buttons, designed to facilitate head passage and make dressing easier.
Briefs or boxers for children?
The choice between briefs and boxers depends on the child's preference, body shape, and the type of clothing worn over them.
Briefs have an essential shape and leave the legs freer. Boxers offer wider coverage and may be preferred by those who like a more encompassing garment.
In both cases, it is important that the waistband remains stable without constricting and that the leg openings do not hinder movement.
How to tell if underwear fits correctly
A correctly sized underwear garment should fit close to the body without compressing. It should follow movements, not roll up constantly, and not leave noticeable marks on the skin.
After the child has put on the garment, it's useful to check:
- that the shoulders stay in place;
- that the fabric doesn't pull on the torso;
- that the waistband isn't too tight;
- that the leg openings are comfortable;
- that the child can move freely;
- that excessive creases don't form under other clothes.
For older children, it is also useful to listen to their feelings. Discomfort, the need to constantly adjust the garment, or difficulty in dressing can indicate that the model or size is not suitable.
How many underwear garments are needed?
There isn't a single number that applies to all families. The quantity depends on the frequency of washing, age, diaper use, and daily activities.
In the first few months, it can be useful to have more bodysuits available, as changes can be frequent. From 2 years old, a small collection of T-shirts, briefs, and boxers can be built up, sufficient to ensure daily rotation and a few spare items.
Before purchasing large quantities of the same size, it may be prudent to try one or two models, check the fit, and only then complete the wardrobe.
How to wash baby underwear
To preserve the shape and softness of the garments, it is necessary to follow the instructions on the label. Temperature, spin cycle, drying, and ironing possibilities may vary based on the composition and construction of the product.
In general, before washing, it is useful to close the snap buttons, separate colors, and not exceed the manufacturer's recommended settings. An excessive dosage of detergent does not necessarily make the laundry cleaner and can leave residues on the fabrics.
An essential choice for everyday
To choose underwear for infants and children, there's no need to look for complex designs. Material, size, flexibility, and practicality are the elements that most impact daily experience.
Bodysuits that are easy to open, comfortable T-shirts, and briefs and boxers that can follow movement help create a simple and functional underwear wardrobe.
The MySanity Baby collection was created with this goal: to accompany infants and children up to 6 years of age with bi-elastic bamboo garments, with clean lines and entirely made in Italy.
Frequently asked questions about underwear for infants and children
What is the best material for baby underwear?
There isn't one single best material for everyone. It's important to choose a soft, flexible fabric suitable for daily use, always checking the full composition and washing instructions.
How to tell if the bodysuit has become too small?
A bodysuit may be too small when it pulls at the shoulders or crotch, when the snaps are difficult to close, or when it leaves noticeable marks around the openings.
Is a short-sleeve or sleeveless bodysuit better?
A short-sleeve bodysuit offers more coverage, while a sleeveless one is lighter and easier to layer with other garments. The choice depends on the temperature and the clothing worn over it.
Up to what age is a bodysuit used?
There is no precise limit. A bodysuit can be used as long as it is practical for changing and comfortable for the child, often up to 24 or 36 months.
When to start using a T-shirt and briefs?
The transition can occur when the child is toilet trained, starts using a potty, or becomes more independent in dressing. Age and needs may vary.
What does bi-elastic fabric mean?
A bi-elastic fabric can stretch in multiple directions. This feature helps the garment better follow the body and movements, without making it a one-size-fits-all, however.