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Until the end of the 20th century, parents were not present during the hospital stay of their newborn. Parents began to enter the units of neonatology with the appearance of developmental care. Nevertheless, the presence of the parents in the units is still a very controversial issue for the staff. Several studies have shown the benefits of parents being the primary caretakers of their newborns: better assessment of the hospitalization, reduction of the rate of maternal depression, improved quality of the interactions with their baby, higher breastfeeding rates, and earlier hospital discharge. This paper reviews the different strategies that allow parents to stay in the neonatal units and their consequences.