Your source for Seattle Mariners gear for babies is the MLB Shop. If you're shopping for your newborn -- congratulations! -- why not start them off on the right foot with Seattle Mariners apparel. We have baby creepers, hats, blankets, toys, all honoring your Seattle Mariners . Whether it's your child or you're looking for a great gift for a newborn in the family, welcome the newest member to your fan club with great Seattle Mariners baby gear from MLB Shop.