Personalized Monkey Infant Sweatshirts. This adorable little brown monkey would make a great Light Blue Infant Sweatshirt. It would make the perfect item for little one's birthdays or just as a fun gift! 7.5 oz., 60% cotton, 40% polyester fleece sweatshirt with cover-stitch neck, shoulders and armholes. Ribbed collar, cuffs and waistband.. Available in sizes 6, 12 and 18 Months.