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1 - 72 of 144
Kids
144 Items
$15.74 with code
Regular: $20.99
You Save: $5.25

Youth Seattle Mariners New Era Navy The League 9Forty Adjustable Hat

Reduced: $23.99
Regular: $54.99
You Save: $31.00

Youth Seattle Mariners Majestic Cream Alternate Cool Base Jersey

Most Popular in Jerseys
Reduced: $20.99
Regular: $29.99
You Save: $9.00

Newborn & Infant Seattle Mariners Navy/Aqua/Gray Born To Win 3-Pack Bodysuit Set

Most Popular in Kids
$82.49 with code
Regular: $109.99
You Save: $27.50

Youth Seattle Mariners Nike White 2020 Home Replica Custom Jersey

Reduced: $35.99
Regular: $54.99
You Save: $19.00

Youth Seattle Mariners Majestic Navy Alternate Cool Base Jersey

$48.74 with code
Regular: $64.99
You Save: $16.25

Youth Seattle Mariners Nike Aqua Alternate 2020 Replica Team Jersey

$44.99 with code
Regular: $59.99
You Save: $15.00

Youth Seattle Mariners Nike Navy Fleece Performance Pullover Hoodie

Most Popular in Sweatshirts & Fleece
Almost Gone!
Almost Gone!
$11.24 with code
Regular: $14.99
You Save: $3.75

Infant Seattle Mariners Navy Primary Logo T-Shirt

$22.49 with code
Regular: $29.99
You Save: $7.50

Newborn & Infant Seattle Mariners Aqua/Navy Shining All-Star 2-Pack Bodysuit Set

Most Popular in Kids
$48.74 with code
Regular: $64.99
You Save: $16.25

Youth Seattle Mariners Nike Navy Alternate 2020 Replica Team Jersey

$28.49 with code
Regular: $37.99
You Save: $9.50 on select sizes

Toddler Seattle Mariners Navy The Windup T-Shirt & Shorts Set

Most Popular in Kids
Almost Gone!
$22.49 with code
Regular: $29.99
You Save: $7.50 on select sizes

Newborn Seattle Mariners Royal/Gold/Cream Three-Pack Number One Bodysuit

Most Popular in Kids
$11.99 with code
Regular: $15.99
You Save: $4.00

Toddler Seattle Mariners Navy Team Primary Logo T-Shirt

$14.99 with code
Regular: $19.99
You Save: $5.00

Youth Seattle Mariners Stance Mascot Crew Socks

Most Popular in Shoes & Socks
Almost Gone!
$33.74 with code
Regular: $44.99
You Save: $11.25

Youth Seattle Mariners Navy Logo Twill Fleece Pullover Hoodie

$22.49 with code
Regular: $29.99
You Save: $7.50

Girls Newborn & Infant Seattle Mariners Navy/Aqua Double Trouble Two-Pack Bodysuit Set

Most Popular in Kids
$48.74 with code
Regular: $64.99
You Save: $16.25

Youth Seattle Mariners Nike Cream Alternate 2020 Replica Team Jersey

$14.99 with code
Regular: $19.99
You Save: $5.00

Youth Seattle Mariners Stitches Heathered Navy Snow T-Shirt

$16.49 with code
Regular: $21.99
You Save: $5.50

Youth Seattle Mariners Soft as a Grape Aqua Cotton Crew Neck T-Shirt

$22.49 with code
Regular: $29.99
You Save: $7.50

Girls Youth Seattle Mariners New Era Aqua Flip Sequin T-Shirt

Almost Gone!
$11.99 with code
Regular: $15.99
You Save: $4.00

Girls Toddler Seattle Mariners White Bubbly Luv T-Shirt

Almost Gone!
Almost Gone!
$29.99 with code
Regular: $39.99
You Save: $10.00

Newborn & Infant Seattle Mariners Nike White Official Jersey Romper

Most Popular in Kids
Almost Gone!
$22.49 with code
Regular: $29.99
You Save: $7.50

Infant Seattle Mariners Royal/Gold/Cream Future Number One Creeper Three-Pack

Most Popular in Kids
Almost Gone!
$23.99 with code
Regular: $31.99
You Save: $8.00 on select sizes

Toddler Seattle Mariners White/Navy Little Hitter V-Neck T-Shirt & Shorts Set

Reduced: $13.99
Regular: $34.99
You Save: $21.00

Youth Seattle Mariners Under Armour Navy MK-1 Performance Shorts

Most Popular in Shorts & Pants
$48.74 with code
Regular: $64.99
You Save: $16.25

Youth Seattle Mariners Nike White Home 2020 Replica Team Jersey

$14.99 with code
Regular: $19.99
You Save: $5.00

Youth Seattle Mariners Navy Primary Logo T-Shirt

$29.99 with code
Regular: $39.99
You Save: $10.00

Youth Seattle Mariners Stitches Navy Team Fleece Pullover Hoodie

$14.99 with code
Regular: $19.99
You Save: $5.00

Youth Seattle Mariners Teal Alternate All Meshed Up T-Shirt

$37.49 with code
Regular: $49.99
You Save: $12.50

Youth Seattle Mariners Navy/Aqua All That Full-Zip Hoodie

Almost Gone!
$33.74 with code
Regular: $44.99
You Save: $11.25

Youth Seattle Mariners Navy Team Color Wordmark Full-Zip Hoodie

Almost Gone!
$16.49 with code
Regular: $21.99
You Save: $5.50

Youth Seattle Mariners Royal Blue Cooperstown T-Shirt

$22.49 with code
Regular: $29.99
You Save: $7.50

Youth Seattle Mariners Nike Navy Early Work Performance T-Shirt

$35.99 with code
Regular: $47.99
You Save: $12.00

Seattle Mariners White Personalized Plush Baby Baseball

Almost Gone!
$14.99 with code
Regular: $19.99
You Save: $5.00

Youth Seattle Mariners Scuff Slide Slippers

Almost Gone!
$17.99 with code
Regular: $23.99
You Save: $6.00

Youth Seattle Mariners New Era Navy On-Field Sport Knit Hat

$22.49 with code
Regular: $29.99
You Save: $7.50

Girls Toddler Seattle Mariners Tiny Turnip Babes White T-Shirt

$33.74 with code
Regular: $44.99
You Save: $11.25

Youth Seattle Mariners ISlide White Tie Dye Slide Sandals

$33.74 with code
Regular: $44.99
You Save: $11.25

Youth Seattle Mariners ISlide White/Black Tie Dye Slide Sandals

Almost Gone!
Almost Gone!
$14.99 with code
Regular: $19.99
You Save: $5.00

Toddler Seattle Mariners Soft as a Grape Navy Logo Wordmark T-Shirt

$67.49 with code
Regular: $89.99
You Save: $22.50

Navy Seattle Mariners Children's Personalized Rocking Chair

Almost Gone!
$22.49 with code
Regular: $29.99
You Save: $7.50 on select sizes

Newborn & Infant Seattle Mariners Navy/Aqua/Gray Everyday Fan Three-Pack Bodysuit Set

Almost Gone!
Almost Gone!
Reduced: $11.99
Regular: $21.99
You Save: $10.00

Girls Youth Seattle Mariners Soft as a Grape Navy Cotton Tank Top

Almost Gone!
$11.99 with code
Regular: $15.99
You Save: $4.00

Toddler Seattle Mariners Navy Primary Team Logo T-Shirt

$17.99 with code
Regular: $23.99
You Save: $6.00

Youth Seattle Mariners Stance Alternate Logo Diamond Pro Socks

$14.99 with code
Regular: $19.99
You Save: $5.00

Youth Seattle Mariners Stance Diamond Pro Crew Socks

Most Popular in Shoes & Socks

Seattle Mariners Kids Apparel

Shop for the very best in Seattle Mariners kids gear and apparel on MLB Shop. We have Seattle Mariners jerseys, shirts, baby creepers, toys, collectibles, and more for your child. Browse items perfect for newborn gifts all the way to older youth jerseys and apparel. Welcome your kids into the Seattle Mariners fan club with their very own gear and begin a fun tradition that can last a lifetime. Whether you're shopping for your kids or looking for an awesome gift, MLB Shop is your source for Seattle Mariners kids gear.