Personalized 1st Birthday Cupcake Pink Adult Sweatshirt. The little girls 1st birthday t-shirt is a sweet and stylish way to celebrate your one year old's special day. With its pink and red color scheme, it's the perfect outfit for the birthday girl to wear on her big day. Stay warm and stylish with this classic adult sweatshirt, perfect for everyday comfort. Crafted from soft, durable fabric, it features a relaxed fit for added coziness. Whether you’re lounging at home, running errands, or enjoying outdoor activities, this versatile sweatshirt is a wardrobe essential for any season.