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Perinatal defines the period occurring around the time of birth (5 months before and 1 month after).
The perinatal period commences at 22 completed weeks (154 days) of gestation (the time when birth weight is normally 500 g), and ends seven completed days after birth. (WHO - World Health Organization).
Legal regulations in different countries include gestation age beginning from 16 - 22 weeks (5 months) before birth.