Summary of the included papers.

Reference		Intervention description	Intended user	Usage context
Breastfeeding education for mothers and training tools for health care professionals
	Abbass–Dick et al, 2018 [33]	Breastfeeding Web resources for indigenous audiences	Mothers	Unspecified
	Cheng et al, 2003 [34]	General breastfeeding Web resources	Parents and parents-to-be	Prenatal
	Joshi et al, 2015 [35]	Bilingual breastfeeding education on touch screen kiosks	Mothers	Postnatal
	Edwards et al, 2013 [36]	Breastfeeding consultation with a computer agent	Mothers	Pre- and postnatal
	Grassley et al, 2017 [37]	Breastfeeding quest game	Mothers	Prenatal
	Huang et al, 2007 [38]	Web-based breastfeeding education program	Mothers	Prenatal
	Joshi et al, 2016 [39]	Bilingual breastfeeding education on touch screen kiosks	Mothers	Postnatal
	Labarere et al, 2011 [40]	Computer-based breastfeeding lessons on CD-ROM	Mothers	Postnatal
	Geoghegan–Morphet et al, 2014 [25]	Web-based breastfeeding resource and virtual infant feeding support clinic	Parents and parents-to-be	Postnatal
	Cianelli et al, 2015 [23]	Breastfeeding electronic learning program on Blackboard Learn platform	Caregivers	Nursing school
	Colaceci et al, 2017 [41]	Breastfeeding electronic learning program on Moodle platform	Caregivers	Career training
	Deloian et al, 2015 [42]	Publicly available breastfeeding Web education—Breastfeeding Basics [43]	Caregivers	Unspecified
	Lasarte Velillas et al, 2007 [44]	Breastfeeding education via Web forums	Mothers and caregivers	Postnatal
	Lewin and O’Connor, 2012 [45]	Publicly available breastfeeding Web education—Breastfeeding Basics [43]	Caregivers	Unspecified
	O'Connor et al, 2011 [46]	Publicly available breastfeeding Web education—Breastfeeding Basics [43]	Caregivers	Unspecified
Breastfeeding encouragement
	Wardle et al, 2018 [47]	Milk Matters app to facilitate breastmilk donation	Mothers	Postnatal
	Gallegos et al, 2014 [48]	Weekly 2-way SMSa to tackle breastfeeding challenges and encourage positive feeding practices	Mothers	Postnatal
	Hmone et al, 2017 [24]	Breastfeeding promotion via SMS	Mothers	Pre- and postnatal
	Jiang et al, 2014 [49]	SMS to improve breastfeeding practice	Mothers	Pre- and postnatal
	Litterbach et al, 2017 [50]	Multichannel infant feeding support and motivation	Mothers	Postnatal
	Maslowsky et al, 2016 [51]	Breastfeeding education and support through mobile phone calls	Mothers	Postnatal
	Zunza et al, 2017 [52]	2-way SMS and motivational interview to promote breastfeeding among HIV positive mothers	Mothers	Postnatal
	Unger et al, 2018 [53]	SMS to improve breastfeeding practices and contraception use	Mothers	Pre- and postnatal
Communication tools
	White et al, 2018 [54]	Milk Man app to engage fathers to support breastfeeding mothers	Fathers	Unspecified
	Rojjanasrirat et al, 2012 [55]	Breastfeeding support via video conference	Mothers	Postnatal
	Friesen et al, 2015 [56]	Breastfeeding support via video conference	Mothers	Pre- and postnatal
	Demirci et al, 2018 [57]	Breastfeeding support via video conference on mobile	Mothers	Postnatal
	Thomas and Shaikh, 2012 [58]	Breastfeeding support over the internet (email, phone call, and Web search)	Mothers	Postnatal
	Giglia et al, 2015 [59]	Web-based resource and multichannel breastfeeding support	Mothers	Postnatal
	Ahmed et al, 2016 [60]	Web-based breastfeeding diary	Mothers	Postnatal
	White et al, 2016 [61]	Milk Man app to engage fathers to support breastfeeding mothers	Fathers	Unspecified
Daily practical supports
	Balaam et al, 2015 [62]	FeedFinder app to facilitate breastfeeding location search	Mothers	Postnatal
	Wang et al, 2018 [63]	MoomMae app, breastfeeding diary and breastfeeding place finder	Mothers	Postnatal
	dela Cruz and Mendoza, 2017 [64]	MilkTrack app to facilitate breastmilk donation process	Mothers	Unspecified
	Chaovalit and Pongnumkul, 2017 [65]	MoomMae app, breastfeeding diary and breastfeeding place finder	Mothers	Postnatal

^aSMS: short message service.