At a Shanghai Carrefour, shopper George Zhai bought a 400 - gram pack of Wyeth's Promil Gold baby formula for 92 yuan.

The level of melamine found in the contaminated infant formula has been as high as 2 560 miligram per kilogram ready-to-eat product, while the level of cyanuric acid is unknown.

According to the previous rules, buyers must pay a duty when the weight of milk powder exceeds 25kg, roughly 27 bottles, and when delivering 10 bottles of cosmetic.