For Perinatal we have terms and definitions in 4 topics. The topics are Baby, HIV and AIDs, Human Reproduction and Medical.

Referring to the period of time before, during, and immediately after birth.
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Around the time of birthæshortly before to shortly afterward.
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Pertaining to the combination of fetal and neonatal periods, currently considered to begin after 20 weeks' gestation and to end 28 days after birth.
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Occurring just before or just after birth
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