Mohammad Ayas, a 12-year-old Rohingya refugee in the sprawling Palong Khali camp, is busy hawking piazu, a fried mixture of onions, lentils and spices.
The 150 portions of piazu, made by his mother from the aid package the family received after fleeing violence in Myanmar, sell for 1 taka each, or a little more than 1 U.S. cent.
"I started my trading here with the relief I got," Mohammad said. "I did not buy anything. I got this relief package five days ago and my mum made this piazu this morning."
It says problems like children trafficking existed in Bangladesh's camps, even before they were overwhelmed by the more than 600,000 new arrivals.
Now, driven by a need for food and other essentials, trade is starting to thrive in the Palong Khali camp, located about 4km (2.5 miles) from the Naf River that marks the border between Bangladesh and Myanmar.
Some refugees are returning to their previous occupations to eke out a living.
Abdur Razzak, 26, sells knives, pots and water buckets in the Palong Khali camp where he set up shop three months ago.
After paying rent on his shop, wages for two assistants and transporting goods from the town of Ukhia, about 9 km (5.4 miles) north of the camp, Razzak earns about 500 taka profit on sales of 2,000 taka.
"I'm not making a lot of money. I just profit a little," he said.