# What the index measured 5WPR sampled standardized buyer-intent prompts—questions people would ask when deciding what baby formula to buy, checking safety, comparing brands by budget, and asking about recalls—across major AI assistants: ChatGPT, Claude, Gemini, Perplexity, and Google AI Overviews. The study tracked how often specific brands were cited in those AI answers.
# The headline results Enfamil leads the category with roughly 20.6% of the estimated citation share. Similac ranks second at 15.8%. ByHeart, which experienced a nationwide recall in November 2025, dropped to 0.6% citation share. Fifteen brands were tracked in total.
# Why these rankings matter Parents increasingly ask AI assistants the same kinds of questions that used to start with a pediatrician, a registry site, or a retailer comparison. When an AI assistant answers—naming brands and describing safety or value—it shapes purchase decisions and brand perception at scale.
AI answers do not simply mirror product quality or regulatory outcomes. Instead, the data shows two practical mechanisms that determine which brands appear most often:
- Recency matters. ByHeart's recall was more recent and led to a faster and deeper collapse in AI citation share than older, more severe events did for other brands. AI systems weight temporal signals heavily in retrieval and ranking.
- Scale and content resources matter. National brands with larger communications and content budgets can produce the dated, citable material retrieval systems favor, which helps them regain or maintain visibility after a problem.
# How recalls behaved in AI
# Practical implications for brands Brands should treat AI visibility as a communications channel with measurable rules:
- Invest in timely, citable content after an incident. Recency in published, authoritative content can blunt visibility losses in retrieval systems.
- Scale matters. Smaller brands face longer recoveries and should allocate resources strategically to recover share of voice in AI-driven answers.
# What this does not claim
# Fast takeaways for decision makers
# Next steps for readers Look at which specific pages AI assistants cite for your brand and competitor brands. Use those sources to guide where to publish clarifications, safety updates, and buyer-intent content so retrieval systems will surface your materials in future AI answers.