Onset of labour is the method by which the process of labour began and includes methods that are used to induce labour, such as surgical or medical induction or a combination of the two.
Dyma’r broses pan fydd yr esgor yn dechrau, ac mae’n cynnwys dulliau a ddefnyddir i gymell esgor, fel dulliau llawfeddygol neu feddygol, neu gyfuniad o’r ddau.