If not now, when? The timing of childbirth and labour market outcomes / Matteo Picchio (Marche Polytechnic University, Ghent University and IZA), Claudia Pigini (Marche Polytechnic University and MoFiR), Stefano Staffolani (Marche Polytechnic University), Alina Verashchagina (Marche Polytechnic University) ; IZA Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, January 2018