Bangladesh officials say they have advised people not to buy the eight brands "until further notice".
"It’s a big public health concern and we’ll sit again on Sunday to take further action," commerce ministry additional secretary Golam Mostakim said.
He said all eight brands had been tested in two other Bangladeshi laboratories but researchers found melamine in only one, a Chinese milk formula.
More tests are to be carried out.
There have been no reports of sickness attributed to melamine in milk powder in Bangladesh, and it is unclear what level of traces of the chemical were discovered in the tests carried out by Dhaka university.
Nestle, which makes one of the powdered milk brands Bangladeshis have been advised not to buy, said that all of its products around the world "are absolutely safe".
"There are no Nestle products made from milk adulterated with melamine," a spokesman said.
He said Nestle was seeking clarification from Dhaka University on its test result. He also pointed out that two laboratories outside Bangladesh had tested the same Nestle product and found it to contain no melamine.