Trade Minister Todd McClay says the Government is assessing the implications of recent regulatory changes in China's cross border e-commerce market.
China's tax bureau introduced a tax on imported products purchased online this month.
In another development, it has issued a "positive list" of types of goods allowed to enter the country via free trade zones and sold online.
Products including milk powder and long-life milk are understood to have been excluded from the tax bureau's list.
News of the changes drove steep falls earlier in the week in stocks linked to infant formula and vitamin sectors, including NZX-listed A2 Milk.