Walking up and down the baby food aisle at a busy supermarket, Cui Guizhong carefully studies what to feed his three-month-old granddaughter.

He printed off a list of 22 milk powder companies whose products contained the banned chemical melamine.

A woman and her baby return Sanlu brand milk powders in a supermarket in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region Sept. 17, 2008.

"My granddaughter drank Sanlu powdered milk first but then we changed to Yashili after the tainted milk scandal broke," he said. "Just a day later, Yashili was also contaminated. I really don't know what to buy."

Putting on glasses, the 62-year-old read through every brand of powdered milk on the shelf. He even discussed his options with the supermarket assistants and wrote down notes.

Beside Cui, a young couple carrying their baby boy in their arms, was also checking out formulas. Their three-month-old son is fed with powdered milk made by Yili, a leading domestic dairy brand.

"The milk powder we bought was not in the list of adulterated products, but we were not quite sure whether it was safe or not as one of Yili's products was on the list," said the father Deng Shangyun. "We haven't made up our mind to change to another brand as our son is used to this one and might not like something different."

A supermarket staff registers the returned Sanlu brand milk powders in a supermarket in in Hefei, capital of east China's Anhui Province Sept. 17, 2008.

The national dairy market has been hit hard by the scandal.

"We removed all tainted milk once we read the news on Tuesday night," said Wang Pingchuan, the general office director of Baolongcang supermarket, a leading retailer in Hebei's provincial capital Shijiazhuang.

Many parents are now turning to foreign brands.

High-end Renmin Department Store reported foreign milk powder sales have doubled.