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In page Infant mortality:

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Infant mortality caused by premature birth is mainly attributed to developmental immaturity, which impacts multiple organ systems in the infant's body.[9] The main body systems affected include the respiratory system, which may result in pulmonary hypoplasia, respiratory distress syndrome, bronchopulmonary dysplasia (a chronic lung disease), and apnea.[9] Other body systems that fully develop at a later gestational age include the gastrointestinal system, the skin, the immune system, the cardiovascular system, and the hematologic system.[9] Poor development of these systems increases the risk of infant mortality.[citation needed]