Low birth weight can affect nearly every organ in the body. Some low-birth-weight babies need special care in the hospital after birth. They may need help with breathing, staying warm, protection against infection, and getting enough nutrition. They may have problems with their lungs, intestinal tract, vision and hearing, and future developmental delays. Some of these problems will get better over time, but some may be lifelong. For very low-birth-weight babies, specific health concerns vary greatly and are closely linked to their birth weight.