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1 - 72 of 181
Kids
181 Items
Reduced: $35.99Regular: $59.99You Save: $24.00

Youth Seattle Mariners Ken Griffey Jr. Aqua Player Replica Jersey

Most Popular in Jerseys
Reduced: $29.99Regular: $44.99You Save: $15.00

Toddler Seattle Mariners Ken Griffey Jr. Majestic Alternate Teal Official Cool Base Player Jersey

Most Popular in Jerseys
$17.99 with codeRegular: $23.99You Save: $6.00

Infant Seattle Mariners New Era Navy My First 9FIFTY Adjustable Hat

$14.99 with codeRegular: $19.99You Save: $5.00

Infant Seattle Mariners New Era Navy My 1st 9TWENTY Adjustable Hat

$82.49 with codeRegular: $109.99You Save: $27.50

Youth Seattle Mariners Nike White 2020 Home Replica Custom Jersey

$29.99 with codeRegular: $39.99You Save: $10.00

Newborn & Infant Seattle Mariners Nike White Official Jersey Romper

Most Popular in Kids
$16.49 with codeRegular: $21.99You Save: $5.50

Newborn & Infant Seattle Mariners Royal/Tan Cooperstown Collection Groovy Game Two-Pack Bodysuit Set

Most Popular in Kids
$22.49 with codeRegular: $29.99You Save: $7.50

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

Most Popular in Kids
Almost Gone!
$44.99 with codeRegular: $59.99You Save: $15.00

Youth Seattle Mariners Nike Navy Fleece Performance Pullover Hoodie

$15.74 with codeRegular: $20.99You Save: $5.25

Toddler Seattle Mariners New Era Navy My 1st 9TWENTY Adjustable Hat

$23.99 with codeRegular: $31.99You Save: $8.00

Toddler Seattle Mariners White/Navy The Lineup V-Neck & Shorts Set

Most Popular in Kids
Reduced: $32.99Regular: $54.99You Save: $22.00

Youth Seattle Mariners Majestic Cream Alternate Cool Base Jersey

Reduced: $32.99Regular: $54.99You Save: $22.00

Youth Seattle Mariners Majestic Navy Alternate Cool Base Jersey

Almost Gone!
$16.49 with codeRegular: $21.99You Save: $5.50

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

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$29.99 with codeRegular: $39.99You Save: $10.00

Youth Seattle Mariners Navy Logo Twill Fleece Pullover Hoodie

$48.74 with codeRegular: $64.99You Save: $16.25

Youth Seattle Mariners Nike Aqua Alternate 2020 Replica Team Jersey

$22.49 with codeRegular: $29.99You Save: $7.50

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

Most Popular in Kids
$14.99 with codeRegular: $19.99You Save: $5.00

Youth Seattle Mariners New Era Navy Team Truckered 9FORTY Snapback Hat

$14.99 with codeRegular: $19.99You Save: $5.00

Youth Seattle Mariners Navy Primary Logo Team T-Shirt

Reduced: $21.99Regular: $34.99You Save: $13.00

Youth Seattle Mariners Under Armour Navy MK-1 Performance Shorts

$48.74 with codeRegular: $64.99You Save: $16.25

Youth Seattle Mariners Nike Navy Alternate 2020 Replica Team Jersey

$18.74 with codeRegular: $24.99You Save: $6.25

Youth Seattle Mariners Navy Stolen Base Performance T-Shirt

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Reduced: $32.99Regular: $54.99You Save: $22.00

Youth Seattle Mariners Majestic White Home Cool Base Jersey

$22.49 with codeRegular: $29.99You Save: $7.50

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

Most Popular in Kids
$11.24 with codeRegular: $14.99You Save: $3.75

Infant Seattle Mariners Navy Primary Logo T-Shirt

$16.49 with codeRegular: $21.99You Save: $5.50

Youth Seattle Mariners Royal Blue Cooperstown T-Shirt

$11.99 with codeRegular: $15.99You Save: $4.00

Toddler Seattle Mariners Navy Primary Team Logo T-Shirt

$48.74 with codeRegular: $64.99You Save: $16.25

Youth Seattle Mariners Nike Cream Alternate 2020 Replica Team Jersey

Almost Gone!
$22.49 with codeRegular: $29.99You Save: $7.50

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

Most Popular in Kids
$28.49 with codeRegular: $37.99You Save: $9.50

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

$15.74 with codeRegular: $20.99You Save: $5.25

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

$22.49 with codeRegular: $29.99You Save: $7.50

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

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

Youth Seattle Mariners Nike White Home 2020 Replica Team Jersey

Reduced: $28.79Regular: $47.99You Save: $19.20

Youth Seattle Mariners Stitches Navy Logo Button-Down Jersey

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$33.74 with codeRegular: $44.99You Save: $11.25

Youth Seattle Mariners Navy Team Color Wordmark Full-Zip Hoodie

Most Popular in Sweatshirts & Fleece
$14.99 with codeRegular: $19.99You Save: $5.00

Youth Seattle Mariners Teal Alternate All Meshed Up T-Shirt

Reduced: $23.99Regular: $39.99You Save: $16.00

Youth Seattle Mariners Stitches Navy Team Fleece Pullover Hoodie

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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.