Newborns placed in a sleep sack were less active and touched parts of their bodies less frequently than those dressed in a simple bodysuit. The scientists suppose that the former may have been more stressed for two reasons: their movements were hampered, so that comforting self-touching was less frequent. This study is published on 17 March 2015 in Scientific Reports.
Unexpected behavioural consequences of preterm newborns’ clothing, Virginie Durier, Séverine Henry, Emmanuelle Martin, Nicolas Dollion, Martine Hausberger, Jacques Sizun. Scientific Reports, 17 March 2015. DOI : 10.1038/srep09177