expulsion stage of labour; expulsive stage
Medical term for the second stage of labour, from full cervical dilation to delivery of the baby.
The expulsion stage is the phase from full cervical dilation until the baby is born.
後産期 is the third stage of labour (delivery of the placenta), following 娩出期.
Compound of 娩出 (expulsion, delivery) + 期 (stage, period). The exact historical derivation is uncertain; the spelling is conventionally associated with medical terminology.