“…The argument is mainly based on the relation between sibship size, income and nutritional dilution, crowding and the higher chances of infection in larger families (Bailey, Hatton, & Inwood, 2016;Hatton, 2017). Yet results are mixed: some studies found a significant negative effect of the number of siblings on the height of individuals (De Keyser & Van Rossem, 2017;Mazzoni, Breschi, Manfredini, Pozzi, & Ruiu, 2017;Myrskylä, Silventoinen, Jelenkovic, Tynelius, & Rasmussen, 2013;Roberts & Warren, 2017;Stradford, van Poppel, & Lumey, 2017), while others found effects which are weak or disappear over time (Beekink & Kok, 2017;Öberg, 2015;Poulain, Chambre, Herm, & Pes, 2017;Ramon-Muñoz & Ramon-Muñoz, 2017). The latter argued that the changing role of sibship size could be caused by fertility decline, the general improvement of standards of living, the development of the welfare state, and improving health.…”