**Acknowledgements**

I acknowledge the generosity of my MSc students Maria Frangou and Maria Andreaki for allowing me to use their data for this chapter. Furthermore, I acknowledge that the second study derives from the Babies Born Better project, which was developed as part of the EU-funded COST Action IS0907, and continued in EU COST Action IS1405: BIRTH: "Building Intrapartum Research Through Health - an interdisciplinary whole system approach to understanding and contextualizing physiological labor and birth" (http://ww.cost.eu/COST\_Actions/isch/IS1405).
