“…Whereas normative infant development is characterized by large fluctuations in crying behavior (de Weerth et al, 1999) and a gradual consolidation of the sleep–wake cycle (Wolke, 2019), infant crying and/or short sleep durations are related to parental experience of exhaustion, depression, and anxiety (de Kruijff et al, 2021; Kurth et al, 2011; Petzoldt et al, 2016), and can even lead to maltreatment (Hemmi et al, 2011; Lee et al, 2007). Moreover, research indicates that excessive infant crying is a risk factor for later poor mental health outcomes, including socioemotional and inattention problems (Botha et al, 2019), and that shorter durations of infant sleep are a risk factor for the development of childhood obesity, impaired growth, and behavioral problems (Chaput et al, 2017; Gillman & Ludwig, 2013; Valla et al, 2021; Zhou et al, 2015). These findings highlight the fact that finding easily accessible ways for parents to reduce infant crying duration and extend infant sleeping duration during the first postnatal months may be beneficial for both parents and infants alike.…”