Honestly, from what I've heard, Similac's main infant formulas (like Similac Gain Plus for below 1 year) are generally considered suitable for lacto-ovo vegetarians since they're dairy-based with no meat-derived ingredients, but it's really worth double-checking the label for any fish oil or animal-derived DHA, as someone in my mum group mentioned that some formulas sneak in fish-sourced DHA which might be a concern depending on how strict you are. The good news is that dairy and egg-derived ingredients in infant formula are typically fine for lacto-ovo use, so the base formula itself should be okay! I'd recommend calling Similac's customer service line directly to confirm the specific DHA and other nutrient sources for the exact tin you're buying, they're usually pretty helpful with those kinds of questions.