Real Dictionary

perinatal
Perinatal deaths, problems, or experiences happen at the time of birth or soon after the time of birth.

perinatal in American English
of, involving, or occurring during the period closely surrounding the time of birth
adjective: occurring during or pertaining to the phase surrounding the time of birth, from the twentieth week of gestation to the twenty-eighth day of newborn life

perinatal in British English
adjective: of, relating to, or occurring in the period from about three months before to one month after birth