Vending or selling various goods and services is the predominant activity. The rest work in small stalls or are mobile small-scale sellers. Almost all are boys. Another very large occupation is domestic service. Huge numbers of girls live and work in other people's homes as maids.
Nobody knows how many domestic servants there are exactly, but it is very high indeed.
Estimates for Dhaka alone range from 200.000 to one million, of which almost all are girls. Scavengers are probably the third largest group. An estimated 100.000 waste collectors of various kinds in Dhaka roam around rubbish dumps or wander the streets. Up to one-third are girls. Workers in small informal factories are almost all boys.