Around 8% of babies are born prematurely in the UK. Preterm babies (born at or before 37 weeks of pregnancy) are particularly vulnerable as most weight gain occurs between 36 and 40 weeks of pregnancy. Premature babies have very different nutritional requirements to full term infants as they need to attain the growth that would have occurred in utero, as well as achieve functional development. Learn more about the unique nutritional needs of preterm infants below.