February 22, 2017 0139 GMT
But the fourth of five children, all born in a Dhaka slum, Ali shows one danger sign — at 80 centimeters tall, he is a good 10cms shorter than the ideal height for a boy his age, the star.com reported.
Poverty and a diet of mostly boiled rice or mashed potato are partly to blame for his stunting, which is caused by a lack of nutrients, protein, vitamins and minerals found in meat, fruit and vegetables.
Research shows that insufficient nutrition in the first 1,000 days of a child's life can lead to irreversible damage to health, growth and development.
Nutritious food has become even harder to afford since Ali's father was forced to work in a brick factory to pay off a debt.
It will take him at least six months to pay back what he owes, depriving the family of the little income he would earn pulling rickshaws around Dhaka's teeming streets.
"How can I feed the children? How can I pay the rent?" said Ali's mother, Taslima Begum, who spends her days picking up discarded plastic bottles in an upmarket neighborhood to sell for recycling in the hope of making a dollar or two.
The rate of stunting in under-fives in Bangladesh has fallen to 36 percent from 45 percent in 2000, official figures show, partly due to a growing economy which has helped lift some 20 million people out of poverty over the last two decades.
But more than 5.5 million Bangladeshi children under the age of five are still affected by the condition.
Health experts say a major challenge for the government is to reduce stunting especially in ever-expanding slums, where it is worse than in other areas.
"There has been a reduction in the level of stunting in Bangladesh but it remains unacceptably high," Anuradha Narayan, nutrition chief at the United Nations Children's Fund (UNICEF) in Bangladesh, told the Thomson Reuters Foundation.
At present, Bangladesh is still one of 20 countries in the world with the largest burden of stunting among children."
A 2016 survey by UNICEF and the Bangladeshi government shows the poorest children are disproportionately affected with 40 percent of children in slums who are stunted, compared with the overall urban average of 26 percent.
"Children in urban slums tend to be from families that are among the most vulnerable," Narayan said. "Families in urban slums might be more food insecure, but also live in environments which increase the risk of disease and infections."
Of Bangladesh's 160 million people, around 2.2 million live in 14,000 slums, according to a 2014 slum census.
In Balurmath slum where Ali grew up, the putrid smell of sewerage seeps through the air as children play barefoot in the narrow alleys lined by corrugated iron houses.
Residents bathe in the open, close to women filleting fish and girls cooking on mud stoves.
Poor sanitation and diseases linked to dirty water such as diarrhea, which causes vital nutrients to be lost from the body, are a common scourge.
UNICEF's Narayan said progress was hampered by the government's focus on development through infrastructure.
"Investments in nutrition don't get attention that a bridge or road or infrastructure project might get," she said.
Ministry of health officials agree more needs to be done to improve nutrition among slum residents.