Table 3:

Representative posts on eating behaviors and related subtheme

Major Theme: Eating behaviors
Number of participants posting about theme: 25 women
Total number of posts about theme: 180 posts
Subtheme	Demographics	Gestational age at time of post	Weight data	Facebook post
Cravings (n=94)	23 yo, black / non-Hispanic, vocational training	5 weeks	BMI 22.3, +37lbs, over	“i want everything 2 eat but i’ll settle 4 home made cheese burgers & some onion rings”
	22 yo, black / non-Hispanic, some college	21 weeks	BMI 25.9, +37lbs, over	“i need fries from mcdonald’s and a icee from burger king!”
	20 yo, black / non-Hispanic, high school graduate	22 weeks	BMI 33.6, −3lbs, under	“I crave sugar…sugar…sugar…n more sugar”
	23 yo, black / non-Hispanic, vocational training	23 weeks	BMI 22.3, +37lbs, over	“i’ll try the no pork thing after this baby. my cravings are too real! wtbs; fried pork chops, mac & cheese, broccoli w/ cheese, & biscuits 4 dinner”
	17 yo*	24 weeks	BMI 25.5, +17lbs, within	“up craving chicken nuggets with sweet and sour sauce and a caramel frappe with extra caramel with a medium fry fresh asf”
	22 yo, white / non-Hispanic, some high school	30 weeks	BMI 19.2, +35lbs, within	“I’m having the type of day where I just want to eat eat and eat. I think that’s what I’m going to do.”
“Baby wants…” (n=15)	19 yo, black / non-Hispanic, high school graduate	11 weeks	BMI 22.2, +45lbs, over	“my little baby love bacon, i crave it all day i’m about to make me a bacon bagel sandwhich”
	17 yo*	13 weeks	BMI 25.5, +17lbs, within	“i absolutely hate doritos but ...my baby seems to love them .... i just wannathrow every pack of doritos i have away cause every time i look at them it’s like my soul tell me to eat them”
	24 yo, black / non-Hispanic, high school graduate	17 weeks	BMI 22.6, +30.5lbs, within	“so me and peanut just ate and i think peanut still hungry cause for the first time after eating i’m not full”
		34 weeks		“i have stuffed my face three times today...i feel super fat lol but i know my baby girl ate good…”
Feeling unwell as justification for unhealthy eating (n=14)	20 yo, mixed / Hispanic, some high school	11 weeks	BMI 19.7, +36lbs, over	“haven’t kept anything down in 3 days... now im craving ichiban”
	17 yo*	14 weeks	BMI 25.5, +17lbs, within	“i don’t see how y’all eat so much when y’all pregnant... my appetite has decreased tremendously. i don’t want to eat anything or have a taste for anything. i only cook for [name] and my family literally. i snack on things throughout the day but it’s never a whole entire meal i can eat”
Sharing diet-related behaviors with others (n=74)	23 yo, black / non-Hispanic, vocational training	18 weeks	BMI 22.3, +37lbs, over	“about 2 make pepper steak & rice 4 the first time! thinking about corn bread w/ it. idk! what y’all make w/ y’all pepper steak & rice?”
	22 yo, white / non-Hispanic, high school graduate	25 weeks	BMI 24.5, +47lbs, over	“shout out to all the pregnant girls on my facebook! we have a reason to stuff our facess lol”
	22 yo, mixed / non-Hispanic, high school graduate	33 weeks	BMI 19.2, +13lbs, under	“omg i have the worst stomach ache i just ate potato soup, a yogurt, a pickle, peaches and drunk a cup of pickle juice.. lmaaaao”
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” | lmao = “laughing my ass off” | wtbs = “with that being said” | asf = “as fuck” omg = “oh my god/gosh” | idk = “I don’t know”