Funding for this research was provided by:
Università degli Studi di Torino (NORI_RILO_18_01)
Università degli Studi di Torino
Accepted: 21 May 2021
First Online: 13 July 2021
: This ethological research project, completely noninvasive, is in compliance with the most recent privacy regulation (EU Regulation 2016/679; Italian DL 101/2018) was approved by the Bioethics Committee of the University of Torino (permit n. 195246).
: In compliance with the national and European regulation (Italian Legislative Decree no. 196/2003; EU General Data Protection Regulation 2016/679), women were recruited after signing an informed consent through which they agreed to participate in the trials and granted permission (a) to be video-recorded during the experiment and (b) to have the video used for the purposes of this study.
: The mothers of the newborns in Fig. InternalRef removed have given their full written consent. No other sensitive material is published with the present study.
: The authors declare that they have no conflict of interest.