ObjectivesTo investigate the sociodemographic and behavioural factors associated with incidence, persistence or remission of obesity in a longitudinal sample of Australian children aged 4–10 years.SettingNationally representative Longitudinal Study of Australian Children (LSAC).ParticipantsThe sample for this analysis included all children in the Kinder cohort (aged 4–5 years at wave 1) who participated in all four waves of LSAC (wave 1, 2004, aged 4–5 years; wave 2, 2006, aged 6–7 years; wave 3, 2008, aged 8–9 years and wave 4, 2010, aged 10–11 years). Of the 4983 children who participated in the baseline (wave 1) survey, 4169 (83.7%) children completed all four waves of data collection.Primary and secondary outcome measuresMovement of children between weight status categories over time and individual-level predictors of weight status change (sociodemographic characteristics, selected dietary and activity behaviours).ResultsThe study found tracking of weight status across this period of childhood. There was an inverse association observed between socioeconomic position and persistence of overweight/obesity. Sugar-sweetened beverages and fruit and vegetable intake and screen time appeared to be important predictors of stronger tracking.ConclusionsOverweight and obesity established early in childhood tracks strongly to the middle childhood years in Australia, particularly among children of lower socioeconomic position and children participating in some unhealthy behaviour patterns.

International and national infant feeding guidelines recommend that "infants are exclusively breastfed until around 6 months of age when solid foods are introduced, and that breastfeeding is continued until 12 months of age and beyond, as long as the mother and child desire" (National Health and Medical Research Council, 2012, p. 12; World Health Organization, 2016). However, many women stop breastfeeding earlier than planned for many reasons, including common breastfeeding problems, maternal or infant illness, and poor community acceptability (Odom, Li, Scanlon, Perrine, & Grummer-Strawn, 2013; Rollins et al., 2016). Sources of support and information for breastfeeding women have traditionally been family members, health professionals, books, and magazines (Newby, Brodribb, Ware, & Davies, 2015; Rollins et al., 2016). The Internet has become a source of information, and there is some evidence that Internet-based support can improve exclusive breastfeeding rates (Giglia, Cox, Zhao, & Binns, 2015). More recently, the explosion of mobile telephone use has allowed this device to become a source of health promotion and selfmanagement of disease (García-Gómez et al., 2014; Mendiola, Kalnicki, & Lindenauer, 2015). Smartphone applications, commonly referred to as apps, are software that 794181J HLXXX10.