Some babies born too early show signs and symptoms later in life that may be long-term consequences of preterm birth. To look at this in more detail, follow-up studies are of great importance. Their results provide a scientific basis for follow-up and continuing care. A study from Sweden recently analysed lung function in 6½-year-old children born at less than 27 weeks. These extremely preterm born children had suffered from immature lungs after birth, and almost all of them had developed…