Remember the bundle-of-joy adage? Each newborn among multiples is less a bundle and more a teeny, tiny package. Because multiples weigh in far below the 7- to 8-pound (3,200- to 3,600-gram) birth weight of single-birth babies, they often have health problems [source: Raising Twins]. They're often born premature, which means they're underdeveloped in many ways. This can lead to jaundice, lack of intricate muscle coordination in the eyes, or life-threatening problems. Even if your multiples are relatively healthy, you may find yourself spending the first few weeks of their lives in a hospital as they're monitored and assisted with growing to a healthy, sustainable weight [source: Swenson].