Serena Williams donates leftover “super soldier” breast milk: “That’s G.O.A.T. milk!”

Serena Williams may not celebrate Christmas, but she’s still giving back during the holidays by helping parents and children in need.

During a recent trip to New York, the 23-time Grand Slam champion—who gave birth to her second daughter Adira in August—ended up with quite a bit of leftover breast milk. Rather than taking it home or tossing it out, the 42-year-old chose to donate it to a local milk bank instead.

“I know so many amazing women that adopt or are unable to make milk. It felt amazing,” Serena wrote on Instagram, as she shared a video of a freezer full of milk to be donated. “BTW Someone out there is getting some super soldier milk. 🤭”

Serena added that her donation would be kept anonymous, and explained she had to go through a screening before being allowed to donate.

Of course, it wasn’t long before the jokes and puns started pouring in at the idea of an unsuspecting New York baby receiving the former world No. 1’s anonymous donation:

“That’s G.O.A.T. milk!” one user wrote, while another comment read, “Some kids' backhand just got stronger.”

“The baby that will drink this milk will become the next Wimbledon winner,” another added.

According to Motherly, there are many reasons why a parent will decide to use donated breast milk. These can vary widely, from feeding babies who have allergies, don’t tolerate formula or were born with conditions including cleft lip and cleft palate, to feeding babies who have been adopted or were born premature. Also, in the case of maternal death or absence, or in cases where a parent can’t produce milk or breastfeed as a result of medications or medical procedures including mastectomies, donated breast milk can make a world of difference.

In the comments under Serena’s post, many parents also joined in to praise the American for raising awareness for this often overlooked practice.

“My baby (was) adopted and ended up having severe dairy allergies, so we relied on donor milk. It was such a gift to us and I’m always so grateful when I think about it!” wrote a user named Katie.

“As a NICU mom of twins who needed donor milk while waiting for mine to come in, thank you for donating,” a user named Carly said in the comments.

“Love not only that you did this but that you’re posting about it to bring much needed attention and visibility to the need for donor milk! Thank you!” another user named Katie added.

For those who have been inspired to donate, here’s a quick guide from WebMD on how to support your nearest milk bank.