Table 1.

Parenting Science Gang Facebook Groups in Year 1 and 2, including description of how they were recruited

Facebook Group Name	Year	Origin of Group
Breastfeeding Older Babies and Beyond (BOBAB)	1	SC was a long-standing member of this group, thought it would be a good fit for the project, and approached the admins and had a number of discussions leading to a partnership
UK Breastfeeding and Parenting Support (UKBAPS)	1	Nappy Science Gang active member was an admin and suggested the collaboration
Science-Aware Natural Parenting (SANP)	1	Contact from Nappy Science Gang
Dumfries and Galloway Bumps Babies and Beyond (DGBBB)	1	An active member of Nappy Science Gang was a member of this group and suggested it
Mealtime Hostage (MH)	2	Applied to become a group via a process advertised on our website and Facebook page
Breastfeeding Health Care Experiences (BF HCE)	2	Discussions within PSG BOBAB and UKBAPS groups led to the creation of this group which then recruited members from other PSG groups, and other interested parenting groups
Let Toys Be Toys (LTBT)	2	RB member of LTBT and invited them to collaborate
Big Birthas (BB)	2	SC met at a conference