Update your browser for a better shopping experience!

Get faster load times, stronger security and access to all features.

Skip to content

This weekend only: save €10 with Sparks
Up to 30% off your favourite brands
Get cosy: 20% off selected homeware

Search product, code or brand

Sign in

0

Search product, code or brand

Best Sellers
Everyday Basics
Cardigans
Cashmere
Coats & Jackets
Co-Ords
Dresses
Jeans
Jumpers
Shirts and Blouses
Skirts
Sportswear
Summer Shop
Tops
Trousers
T-Shirts
Workwear

All Dresses
Maxi Dresses
Midi Dresses
Summer Dresses
Wedding Guest Dresses

All Jeans
Barrel Leg Jean
Straight Leg Jean
Wide Leg Jean

Lingerie & Nightwear

Bras
Knickers
Nightwear

All Shoes
Ballet Flats
Boots
Heels
Trainers

Accessories & Bags

All Accessories
Handbags & Bags

Body Fit & Maternity

Curve
Maternity
Petite
Tall

The Love That Drop

The Workwear Edit

Up to 30% off Women's Brands

Up to 30% off Beauty

Value You Can Trust

All Bras
Balcony Bras
Bra Accessories
Cotton Bras
Demi Cup Bras
First Bras
F-K Bras
Full Cup Bras
Maternity and Nursing Bras
Multipack Bras
Non-Wired Bras
Post-Surgery Bras
Padded Bras
Sports Bras
Strapless Bras

All Knickers
Brazilian Knickers
Cotton Knickers
Full Brief Knickers
High-Leg Knickers
Multipack Knickers
No-VPL Knickers
Thongs

All Shapewear
Anti-Chafing Shorts
Bodies
Shaping Knickers
Slips

All Nightwear
Cotton Pyjamas
Dressing Gowns
Nightdresses
Pyjamas
Pyjama Sets
Slippers

Socks & Tights

Socks
Tights

Thermals & Vests

Thermals
Vests & Camis

Book your Bra Fit

Value You Can Trust

Clothing

Cashmere
Casual Shirts
Chinos
Hoodies
Jackets & Coats
Jeans
Joggers
Knitwear
Polo Shirts
Shirts
Shorts
Sportswear
Summer Shop
Sweatshirts
Tops
Trousers
T-Shirts

Suits & Formalwear

All Suits
Blazers
Formal Shirts
Office Wear
Smart Trousers
Ties
Tuxedos

Nightwear & Underwear

All Nightwear
Pyjamas
Pyjama Sets
Socks
Underwear
Vests

Our Top Picks
Denim Edit
Trending: Dark Denim

All Shoes
Loafers
Smart Shoes
Summer Shoes
Trainers

All Accessories
Bags
Belts
Hats

What to Wear to the Office

Our Transitional Top Picks

Up to 30% off Men's Brands

Value You Can Trust

Girls (2yrs-16yrs)

Accessories
Dresses
Footwear
Jackets and Coats
Jeans
Joggers
Jumpers and Cardigans
Leggings
Nightwear
Outfits and Sets
Skirts
Socks and Tights
Summer Shop
Swimwear
Tops
Underwear and Vests

Boys (2yrs-16yrs)

Accessories
Footwear
Jackets and Coats
Jeans
Joggers
Jumpers and Sweatshirts
Nightwear
Outfits and Sets
Shirts
Shorts
Socks
Summer Shop
Swimwear
Trousers
Tops
Underwear and Vests

Baby Boy
Baby Girl
Baby Grows
Baby Outfits
Baby Toys
Newborn Clothing

Boys' Uniform
Girls' Uniform

Everyday Essentials

Nightwear
Underwear
Socks

Just Arrived Girls'

Just Arrived Boys'

Just Arrived Baby

Everyday Essentials

Trending: Everyday Adventure

Blazers
Dresses
Jumpers & Cardigans
PE Kit
Polo Shirts
Shirts & Blouses
Shoes
Shorts
Skirts
Trousers

Blazers
Jumpers
PE Kit
Polo Shirts
Shirts
Shoes
Shorts
Trousers

School Essentials

First Bras
Lunch Boxes
School Bags
Socks
Tights

Shop by Colour

Black
Blue
Green
Grey
Navy
Red
White

Shop By Age - Girls'

2-8 Years
8-18 Years

Shop By Age - Boys'

2-8 Years
8-18 Years

All School Uniform

School Trousers

School Shoes: Featuring Clarks

All Bedding
Bed Sheets
Duvets
Duvet Covers & Sets
Mattress Protectors
Pillows
Pillowcases

Cooking & Dining

Dinner Sets
Glassware
Kitchenware
Mugs
Outdoor Dining
Pots & Pans
Tableware

Home Furnishings

Cushions
Cushion Covers
Curtains
Rugs
Throws

All Bathroom
Bath Mats
Towels

All Lighting
Ceiling Lights
Floor Lamps
Table Lamps

Home Accessories

Artificial Flowers & Plants
Home Fragrance
Vases
Plant Pots

Summer Shop

Beach Towels
Suitcases & Luggage

20% off selected Home

University Essentials

Neutral Homeware

Christmas Decorations

20% off Skincare

All Skincare
Cleansers
Eye Cream
Face Masks
Moisturisers
Serum
Sun Cream

All Makeup
Beauty Accessories
Blushers
Foundation
Lipstick
Mascara
Nail Care

20% off Bath & Body

All Bath & Body
Hand Cream
Hand Wash
Shower Gel
Travel Size Toiletries
Wellbeing

20% off Fragrance

Women’s Perfume
Men’s Eau de Parfum

20% off Haircare

All Haircare
Conditioner
Hair-Styling Accessories
Shampoo

20% off Beauty Gifts

All Beauty Gifts
Bath & Body Gifts
Perfume Gifts
Skincare Gifts
Make-Up Gifts

20% off Men's Grooming

All Men's Grooming
Men's Aftershave
Men's Gifts
Moisturisers

20% off K-Beauty

All Korean Skincare
Beauty of Joseon
Medicube

Up to 30% off Beauty

Gifts by Price

Gifts Under €20
Gifts Under €30
Gifts Under €50
Luxury Gifts

Gifts by Recipient

Gifts For Her
Gifts For Him
Gifts For Kids
Baby Gifts

Gifts by Occasion

Anniversary Gifts
Birthday Gifts
Congratulations Gifts
Communion Gifts
Housewarming Gifts
Wedding Gifts

All Gift Cards

E-Gift Cards
Corporate Gifts

Gifts for the Family

Gifts for Mum
Gifts for Dad
Gifts for Brother
Gifts for Sister
Gifts for Grandmas

Gifts Under €20

Food

Loved by Customers
Picky Tea
Store Cupboard

The Home of Recipes

Budget Recipes

Food In Store

Store Locator

All Clearance
Women's Clearance
Men's Clearance

Shop Women's Offers

Up to 30% off Women's Brands
Up to 30% off Beauty
20% off Rosie

Shop Beauty Offers

Up to 30% off Beauty
20% off Skincare
30% off Makeup
20% off Bath & Body
20% off Haircare

Shop Home offers

20% off selected Bedding
20% off selected Kitchenware
20% off selected Lighting
20% off selected Home Furnishings

Shop Men's Offers

Up to 30% off Men's Brands
Sartorial Shirts Offers
30% off selected Swimwear Brands

Up to 30% off Women's Brands

Up to 30% off Beauty

20% off selected Home

Up to 30% off Men's Brands

Find store Sparks

Help
Contact Us
Register

Boys Girls Trunks Briefs Knicker shorts Camis Black White Blue Grey Navy Pink Cream Red Beige Green Brown Nude Purple

You are here:

Home
Kids
Kids clothes
Underwear

Kids’ Underwear

Browse our kids’ underwear for cotton-rich combos and vibrant patterns. Stretchy briefs, tights and tops keep youngsters comfy on busy days, and sport-themed designs bring a modern edge. Look out for pure yarns that are gentle on sensitive skin and nursery-ready collections for new mums. Stock up for the season and enjoy free delivery over €75

Knickers
Trunks
Briefs
Thermal

There are 113 Items found

Gender with 4 options
Boys
(67)
Girls
(64)
Unisex
(29)
Womens
(11)
Style with 12 options
Trunks
(21)
Briefs
(15)
Knickers
(14)
Thermal tops
(11)
Thermals
(10)
Vests
(10)
Plunge bra
(9)
Crop top
(8)
School socks
(6)
Knicker shorts
(4)
Bikinis
(2)
Camis
(1)
Search Kids Sizes filter
Kids Sizes with 40 options
2-3 Years
(43)
3-4 Years
(44)
4-5 Years
(39)
5-6 Years
(57)
6-7 Years
(50)
7-8 Years
(51)
8-9 Years
(48)
9-10 Years
(57)
11-12 Years
(42)
13-14 Years
(44)
15-16 Years
(22)
28 A
(11)
28 B
(11)
34 A
(11)
28 AA
(10)
30 A
(10)
30 AA
(10)
30 C
(10)
32 B
(10)
32 C
(10)
32 D
(10)
36 AA
(10)
36 B
(10)
36 C
(10)
38 A
(10)
30 B
(9)
30 D
(9)
32 A
(9)
32 AA
(9)
34 AA
(9)
34 B
(9)
34 C
(9)
34 D
(9)
36 A
(9)
38 B
(9)
12½-3½ Large
(4)
6-8½ Small
(3)
8½-12 Small
(2)
4-7 Large
(1)
7½-10½ Large
(1)
Search Colour filter
Colour with 14 options
Black
(24)
White
(21)
Blue
(13)
Multi-coloured
(12)
Grey
(10)
Navy
(9)
Pink
(9)
Cream
(3)
Red
(3)
Beige
(2)
Green
(2)
Brown
(1)
Nude
(1)
Purple
(1)
Pattern with 3 options
Plain
(79)
Patterned
(28)
Novelty
(4)
€5
€35
Minimum valueMaximum value

There are 113 Items found

Sort by

5 Pack Pure Cotton Heart Print Vests (2-14 Yrs)

M&S5 Pack Pure Cotton Heart Print Vests (2-14 Yrs)

5 Pack of Knee High Socks

M&S5 Pack of Knee High Socks

5 Pack Pure Cotton Plain Vests (2-14 Yrs)

M&S5 Pack Pure Cotton Plain Vests (2-14 Yrs)

5 Pack Cotton Rich Gaming Trunks (5-16 Yrs)

M&S5 Pack Cotton Rich Gaming Trunks (5-16 Yrs)

2pk Non Wired Cotton Rich Ribbed First Bras AA-D

M&S2pk Non Wired Cotton Rich Ribbed First Bras AA-D

2pk Non Wired First Bras AA-D

M&S2pk Non Wired First Bras AA-D

2pk Non Wired Cotton Rich Ribbed First Bras AA-D

M&S2pk Non Wired Cotton Rich Ribbed First Bras AA-D

5pc Cotton with Stretch Bright Trunks (5-16 Yrs)

M&S5pc Cotton with Stretch Bright Trunks (5-16 Yrs)

5 Pack of Knee High Socks

M&S5 Pack of Knee High Socks

5 Pack Cotton with Stretch Trunks (5-16 Yrs)

M&S5 Pack Cotton with Stretch Trunks (5-16 Yrs)

2pk Non Wired First Bras AA-D

M&S2pk Non Wired First Bras AA-D

7 Pack of Ankle School Socks

M&S7 Pack of Ankle School Socks

2pk Non Wired First Bras AA-D

M&S2pk Non Wired First Bras AA-D

5 Pack Pure Cotton Plain Vests (2-14 Yrs)

M&S5 Pack Pure Cotton Plain Vests (2-14 Yrs)

5 Pack Cotton with Stretch Football Trunks (5-16 Yrs)

M&S5 Pack Cotton with Stretch Football Trunks (5-16 Yrs)

5 Pack Cotton with Stretch Trunks (5-16 Yrs)

M&S5 Pack Cotton with Stretch Trunks (5-16 Yrs)

5 Pack Cotton with Stretch Nautical Trunks (5-16 Yrs)

M&S5 Pack Cotton with Stretch Nautical Trunks (5-16 Yrs)

7 Pack Cotton with Stretch Heart Print Shorts (5-16 Yrs)

M&S7 Pack Cotton with Stretch Heart Print Shorts (5-16 Yrs)

5 Pack Pure Cotton Spider-Man™ Briefs (18 Mths - 8 Yrs)

M&S5 Pack Pure Cotton Spider-Man™ Briefs (18 Mths - 8 Yrs)

5 Pack Pure Cotton Vests (2-14 Yrs)

M&S5 Pack Pure Cotton Vests (2-14 Yrs)

3 Pack Cotton with Stretch Racer Crop Tops (6-16 Yrs)

M&S3 Pack Cotton with Stretch Racer Crop Tops (6-16 Yrs)

10 Pack Cotton with Stretch Knickers (2-14 Yrs)

M&S10 Pack Cotton with Stretch Knickers (2-14 Yrs)

10 Pack Pure Cotton Briefs (2-14 Yrs)

M&S10 Pack Pure Cotton Briefs (2-14 Yrs)

7 Pack of Ankle School Socks

M&S7 Pack of Ankle School Socks

5 Pack Cotton with Stretch Cami Tops (5-14 Yrs)

M&S5 Pack Cotton with Stretch Cami Tops (5-14 Yrs)

3 Pack Cotton with Stretch Bikini Knickers (6-16 Yrs)

M&S3 Pack Cotton with Stretch Bikini Knickers (6-16 Yrs)

3 Pack Cotton with Stretch Crop Tops (6-16 Yrs)

M&S3 Pack Cotton with Stretch Crop Tops (6-16 Yrs)

10 Pack Cotton with Stretch Knickers (2-14 Yrs)

M&S10 Pack Cotton with Stretch Knickers (2-14 Yrs)

10 Pack Cotton with Stretch Knickers (2-14 Yrs)

M&S10 Pack Cotton with Stretch Knickers (2-14 Yrs)

5 Pack Pure Cotton Bow Vests (2-14 Yrs)

M&S5 Pack Pure Cotton Bow Vests (2-14 Yrs)

3 Pack Cotton with Stretch Crop Tops (6-16 Yrs)

M&S3 Pack Cotton with Stretch Crop Tops (6-16 Yrs)

5 Pack of Knee High Pelerine Socks

M&S5 Pack of Knee High Pelerine Socks

5 Pack Disney Frozen™ Cotton with Stretch Knickers (2-8 Yrs)

M&S5 Pack Disney Frozen™ Cotton with Stretch Knickers (2-8 Yrs)

10 Pack Cotton with Stretch Trunks (5-16 Yrs)

M&S10 Pack Cotton with Stretch Trunks (5-16 Yrs)

5 Pack Cotton Rich Striped Trunks (5-16 Yrs)

M&S5 Pack Cotton Rich Striped Trunks (5-16 Yrs)

5 Pack Cotton Rich Nautical Trunks (5-16 Yrs)

M&S5 Pack Cotton Rich Nautical Trunks (5-16 Yrs)

7 Pack Animal and Stripe Print Briefs (18 Mths - 10 Yrs)

M&S7 Pack Animal and Stripe Print Briefs (18 Mths - 10 Yrs)

5 Pack Cotton Rich Camo Trunks (5-16 Yrs)

M&S5 Pack Cotton Rich Camo Trunks (5-16 Yrs)

7 Pack Cotton With Stretch Ballerina Knickers (18 Mths - 10 Yrs)

M&S7 Pack Cotton With Stretch Ballerina Knickers (18 Mths - 10 Yrs)

5 Pack Pure Cotton Heart Print Vests (2-14 Yrs)

M&S5 Pack Pure Cotton Heart Print Vests (2-14 Yrs)

5 Pack Pure Cotton Bluey™ Briefs (2-8 Yrs)

€12 - €13.50

M&S5 Pack Pure Cotton Bluey™ Briefs (2-8 Yrs)

2 Pack Heatgen™ Thermal Vests (2-14 Yrs)

M&S2 Pack Heatgen™ Thermal Vests (2-14 Yrs)

2 Pack Heatgen™ Thermal Tops (2-14 Yrs)

M&S2 Pack Heatgen™ Thermal Tops (2-14 Yrs)

10 Pack Cotton Rich Trunks (5-16 Yrs)

M&S10 Pack Cotton Rich Trunks (5-16 Yrs)

2 Pack Heatgen™ Thermal Tops (2-14 Yrs)

M&S2 Pack Heatgen™ Thermal Tops (2-14 Yrs)

5 Pack Cotton with Stretch Trunks (5-16 Yrs)

M&S5 Pack Cotton with Stretch Trunks (5-16 Yrs)

5 Pack Disney Princess™ Cotton with Stretch Knickers (18 Mths-8 Yrs)

M&S5 Pack Disney Princess™ Cotton with Stretch Knickers (18 Mths-8 Yrs)

10 Pack Pure Cotton Briefs (2-14 Yrs)

M&S10 Pack Pure Cotton Briefs (2-14 Yrs)

Page 1 of 3

Free delivery when you spend over €75
Free returns for online orders
Standard delivery within 4 days*

Register to receive exclusive offers tailored to you, plus rewards and promotions before anyone else. Just select ‘YES’ on the next page and never miss a thing.

Enter your email address

Here to Help

Help & Contact Us
Find a store
Product recalls

Delivery & Returns

Where's my order?
Delivery & collection
Guest Orders & Returns
Returns & refunds

Shopping with Us

Sparks
Sparks FAQs
Gift card balance
Size guides
Sustainability

More from M&S

M&S Corporate site
M&S Corporate Gifts
Careers
Gender Pay Gap

Here to Help

Help & Contact Us
Find a store
Product recalls

Delivery & Returns

Where's my order?
Delivery & collection
Guest Orders & Returns
Returns & refunds

Shopping with Us

Sparks
Sparks FAQs
Gift card balance
Size guides
Sustainability

More from M&S

M&S Corporate site
M&S Corporate Gifts
Careers
Gender Pay Gap

© 2026 Marks and Spencer plc (UK)Terms & Conditions Privacy CookiesAccessibility Modern Slavery Act