It's the job of every partner of an expecting woman - making sure the mother of their unborn baby gets whatever strange thing she is craving, whenever she is craving it.
Serena Williams' fiance Alexis Ohanian has revealed what he's doing night-time dashes to the shop for – and it reveals that even pregnancy cravings are super healthy for the elite athlete.
Reddit founder Alexis shared a video on Instagram recently, saying, "It's Friday night, I'm at Publix, going shopping 'cause my fiancée has cravings.
"I was told there would be cravings. I was not told they would be these."
And what do we see Alexis holding, ready to take home to pregnant Serena? A bunch of asparagus, some zucchini and an artichoke.
Not the typical ice-cream or chocolate craved by most pregnant women, that's for sure.
Serena even told E! News last month that since becoming pregnant she is eating healthier than she was before. "It's pretty backwards," she said, adding she's been eating "lots of greens, lots of vegetables," and getting protein from "either fish or different types of nuts and seeds."
The Instagram post is the latest in a series of social media sharing from the down to earth couple who are keeping their first pregnancy very real.
Not only has Serena taken to social media for advice about how to roll over in bed while pregnant, she has also spoken about the arrival of her cankles and asked fellow mums when she should pack her hospital bag.
She also shared one of the unexpected perks of pregnancy.
What's most encouraging about this story though, is a man who will head to the shop to satisfy a pregnant woman's cravings as soon as she has them – no matter what they are. He's definitely a keeper!