Problem Area / factors in milk composition with the importance of breastfeeding Breastmilk contains the necessary nutritional components and energy that the infant needs. Therefore, the milk of the mother delivering early have a higher content of fat and protein, and thereby a higher level of energy comparing with the milk from the mother who have given birth to term. The content of protein in the milk of the mother who gives birth prematurely is about 12 grams per liter and thus approximately one-third higher than that from the mother who gives birth on time. The nutritional composition of breastmilk vary considerably over time and the content of protein is decreasing why the premature infant are at risk of protein deficiency and thereby insufficient growth. During the hospital stay, and while the infant are feed by tube this decreasing protein content are made up by adding, while it is more difficult when the infant breastfeed exclusively. Protein is important for the infant's growth and strength and a local statement from Hvidovre Hospital found that 18% of all hospitalized preterm infants in 2014 were added additional protein to breastmilk, because growth was not sufficient. The question is whether reduced protein content in breastmilk has a correlation with the number of days where preterm infants are exclusively breastfed?