Green’s Dictionary of Slang

childbirth, esp. the actual labour.

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Launch the Delivery of a Lying in Woman, a Crying out or Groaning.
1796		Grose Classical Dict. of the Vulgar Tongue (3rd edn).
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.