President Donald Trump created a potentially existential crisis for Tylenol maker Kenvue Inc. with just three words about the company’s most-recognized product: “don’t take it.” Trump’s warnings about the unproven link between Tylenol use during pregnancy to autism in children risks reinvigorating a barrage of litigation over the issue that the company has sought to put behind it. A federal court in December dismissed lawsuits alleging a link between the active ingredient in the over-the-counter pain trea ...