Personalized North Pole 1st Birthday Baby Sweatshirt. Baby Sweatshirt - Navy for a little elf's 1st birthday with a polka dotted number one and red and white striped North Pole sign. Perfect for Santa's helper on his or her Christmas birthday. Keep your little one warm and comfortable with this soft infant crew fleece sweatshirt. Made from a cozy cotton poly blend, this pullover offers just the right amount of warmth for cooler days without feeling bulky. The snap-tape neck closure makes dressing quick and easy, and the ribbed collar, cuffs, and hem provide a secure fit that moves with your baby. Durable stitching and side-seam construction help the sweatshirt maintain its shape and softness through repeated washing. Great for everyday wear, daycare, playtime, or layering during fall and winter, this fleece sweatshirt is a practical and comfortable essential for any baby wardrobe.