Since becoming a parent, I’ve gotten used to scrolling past videos of babies gnawing on everything from bone marrow to full-size steaks. But lately, the babies on my feed are munching on a new snack: whole sticks of butter. On TikTok, parents are handing their 1-year-olds blocks of Kerrygold to gnaw on while they grocery shop and freezing sticks of butter to help with teething. To hear these moms tell it, butter from grass-fed cows is “the best snack for babies no one talks about” and a miracle food that can supercharge their brain development. In one video, a mother films herself putting a pat of butter directly into her infant’s mouth. “My kids love butter and I let them eat as much as they want,” she wrote in the caption. After cutting up slabs of butter as a late-night snack, another mom yells to her kids, “Come get your treat!”