Date	Event	Description
3 April 2023	New search has been performed	We included five new trials in this update (Conesa‐Segura 2018; Gomes 2016; González‐Bellido 2020; Ramos‐Pinto 2021; Van Ginderdeuren 2017), and excluded three new trials (Sebban 2017; Sebban 2019; Evenou 2017). We identified five ongoing studies (NCT02708147; NCT02853838; NCT03738501; NCT03753802; NCT04553822).
3 April 2023	New citation required and conclusions have changed	Positive effects were observed for slow expiratory techniques. The meta‐analysis of the effects of slow expiratory technique on clinical severity score showed mild but significant effects in decreasing the severity of the infant's condition after the intervention. These positive effects were increased when slow expiratory technique was combined with rhinopharyngeal retrograde technique.