Personalized 4th of July Baby in Utero Maternity Shirts. This adorable 4th of July Uncle Sam baby in utero waving the American flag is perfect for the mommy to be for her to show off her pregnancy White Maternity Shirt. 5.5 oz., 100% combed ringspun cotton jersey tee. taped neck. topstitching on collar. double-needle stitched sleeves and bottom hem. Available in sizes Small, Medium, Large and XL.