No matter how the Chinese economy slows or the stock market stumbles, the country's consumers will not stop washing their clothes or eating cup noodles any time soon. But multinational makers of fast-moving consumer goods are finding it harder to rely on the mainland to take up the slack for other parts of the world.

Growth in sales of daily necessities has tumbled in recent years — even before the latest market gyrations, which could further exacerbate the slowdown, retail analysts say.