Eating like a bird is one thing, but feeding like a penguin is quite another. This week, actress Alicia Silverstone grossed out the entire Internet when she posted a video of herself pre-chewing her son Bear Blu’s food and then spitting it into his mouth. “I just had a delicious breakfast of miso soup, collards and radish steamed and drizzled with flax oil, cast-iron mochi with nori wrapped outside, and some grated daikon. Yum!” Silverstone wrote on her blog. “I fed Bear the mochi and a tiny bit of veggies from the soup … from my mouth to his. It’s his favorite ... and mine.” While many cultures advocate pre-mastication, not all doctors believe the practice is healthy. “There are those who think that a mom chewing a baby’s food provides helpful enzymes from her mouth but it doesn’t seem like a hygienic practice,” Dr. Jennifer Landa told FOX411’s Pop Tarts column.