Monthly inflation picked up slightly in April, a month when businesses were yanked back and forth as they tried to adjust to President Trump’s unpredictable trade policies. The consumer-price index rose a seasonally adjusted 0.2% in April, the Labor Department said Tuesday. That matched the forecasts of economists polled by The Wall Street Journal. However, it was a turnaround from March, when month-over-month prices fell 0.1%. Year-over-year inflation cooled to a 2.3...