Yearly average maternity leave used in the 12 months following birth, by month of birth. Vertical dashed lines indicate a change in maternity leave from 6 to 18 weeks (as of January 1, 2015) and from 18 to 12 weeks (around November to December 2016). The figure includes the linear fit of leave for 6 weeks, unexpected 18 weeks, expected 18 weeks, and 12 weeks, with a gap excluding May 2015 and November to December 2016.