postnatal depression
noun /ˌpəʊstneɪtl dɪˈpreʃn/
  /ˌpəʊstneɪtl dɪˈpreʃn/
 (British English) (North American English post-partum depression)
 [uncountable]- a medical condition in which a woman feels very sad and anxious in the period after her baby is born产后抑郁(症)