Table 5:

Representative posts on influencers of health behaviors and related subthemes

Major Theme: Influencers
Number of participants posting about theme: 16 women
Total number of posts about theme: 43 posts
Sub-theme	Demographics	Gestational age at time of post	Weight data	Facebook post
Partner influencing food choices (n=11)	18 yo, white / non-Hispanic, some college	8 weeks	BMI 31.2, −8lbs, under	“i swear i have the best boyfriend ever! took me to dinner at antonio’s and then the movies. i love you baby”
	24 yo, black / non-Hispanic, some college	14 weeks	BMI 29.2, +29lbs, over	“had a great date with my baby today. went to red robin and got a free birthday burger, stopped by denny’s and got a free birthday breakfast, and went to the park to walk it all off. now i’m sick and tired. but it was worth it.! thank you babe. i love you”
	21 yo, black / non-Hispanic, high school graduate	28 weeks	BMI 40.0, +45lbs, over	“lmbo [name] said im blessed because i told her when [name] take me out to eat im allowed to get a drink and dessert lmbo”
Family and friends influencing food choices (n=25)	17 yo*	9 weeks	BMI 25.5, +17lbs, within	“cried because [name] wanted to take me to taco bell instead of burger king we compromised with wendy’s”
	23 yo, black / non-Hispanic, vocational school	9 weeks	BMI 22.3, +37lbs, over	“pickles & ranch omg so good !!! & [name] got me eating hot fries . this poor baby”
		19 weeks		“real friends satisfy your cravings when you’re pregnant s/o 2 [name]!! hot wings & fries in the making”
	16 yo*	18 weeks	BMI 26.1, +14lbs, under	“i crave slushies all day everyday , and i get what i want because my momma loves me”
	24 yo, black / non-Hispaic, high school graduate	25 weeks	BMI 28.9, +29lbs, over	“i love going to my grandma house she made mac and cheese and gave me most of it”
	19 yo, white / non-Hispanic, some high school	26 weeks	BMI 20.4, +35lbs, within	“i just want to thank my grandma because the other day i really had no energy or patience to go into the store i was sick as a dog so she went out and got me a bunch of fruit,soup,gatorade and crackers...oh and i forgot the vernors. the whole care package and i appreciate it really a lot and i love you very much ,thank you grandma!!!”
Friends influencing body image (n=3)	22 yo, white / non-Hispanic, some high school	24 weeks	BMI 19.3, +35lbs, within	“last time i wore this dress was in june.. [name] you were right this dress that you let me borrow definitely makes my belly pop.”
Friends influencing exercise habits (n=3)	21 yo, black / non-Hispanic, high school graduate	4 weeks	BMI 40.0, +45lbs, over	“i need a consistent , committed workout partner with motivation , dreams and goals ugh wtf !! lol”
	19 yo, mixed race / non-Hispanic, high school graduate	6 weeks	BMI 37.6, +44lbs, over	“that after gym life with [name]”
Other influencing (n=4)	18 yo, white / non-Hispanic, some high school	29 weeks	BMI 18.6, +27lbs, within	“the hardest thing in the world is to stay positive and healthy when the one you love is damn near gone, & everything else comes before you.”
Legend: * = demographics not completed by participant + / − = positive / negative weight gain during pregnancy
Order of listed data: Demographics header = Age (years), race / ethnicity, highest education level obtained Weight data header = Pre-pregnancy body mass index (BMI), weight gain during pregnancy, Institute of Medicine (IOM) classifcation of weight gain at the end of pregnancyR
Common social media abbreviations: lol = “laughing out loud” | lmbo = “laughing my butt off” | wtf = “what the fuck” | s/o = “shout out”