What is child labour: Any child under the age specified by law worldwide works full time, mentally or physically to earn for own survival or adding to family income, that interrupts child’s social development and education is called “child labour”. Any child under the age of 15 engaged in activity to feed family or self is “child labour”. ILO Convention 138 (C. 138) obligates countries to fix a minimum age for employment that should not be less than the age for completing compulsory schooling and, in any event, should not be less than 15 years. Developing countries may set the minimum age at 14. C-138 provides flexibility for countries to establish a younger minimum age of 12 or 13 for children to partake in “light work.” Definitions by:
Children’s participation in economic activity- that does not negatively affect their health and development or interfere with education, can be positive.  Work that does not interfere with education (light work) is permitted from the age of 12 years under the International Labour Organization (ILO) Convention 138. So child engaged in part time work to learn practical skill linked to social or inherited custom or crafts is not child labor. It becomes “child labour” only when child weaves carpet in a factory; earns money to support family without schooling, social development. On the other hand if child works for 3-4 hours to learn or earn for self or parents after schooling, would not be known as child labour as is additional education and practical skill that a child learns.

Definition of elements of worst forms of child labour- all types of slavery, forceful hiring of children, commercial and sexual exploitation of children, hard working condition.

Types of child labour- Self employed and employed with others are two categories of child labour: • Self employed- street sellers, rag or scrap pickers, street entertainers, child prostitution or pornography (but mostly they are hired by notorious gangs), begging, and other odd jobs. These types of children are mainly street children and rural migrants. Most these children are parentless, abandoned by parents, riot or war misery. The situation changes; in poor countries they are helping hand to the parents. • Employed with others- factory or mine workers, domestic servants, child prostitution or pornography. Conducting work in other’s premises or in other’s custody. Such children work with parents consent or are parentless. Some are sold or some work to help parents to meet livelihood.

With the change of world order future education system would be more practical than present system of theory from books and notebooks. Each child would be encouraged to involve in practical education that gives skill to survive in competitive world. So, defining “education” becomes important to define “child labour”. Thus any child works for pleasure, leisure, pocket money, helping parents, hobby, aspiration, non hazardous part time work is not “child labour”. “Child labour” purely counts when child is forced to work under slavery, poverty, parentless or social or parent’s boycott.
 (some explained are my opinion may not be accurate)

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Facts & Figure weblinks

Child prostitute and trafficking Facts & Figure weblinks | Child labor in Textile
 
 
Nearly 90% (in my view) of migrant child laborers are rural children who migrate to cities and end up begging, prostitution, domestic helpers, or other odd jobs. Child labour issue can not be dealt until and unless concerned organizations influence appropriate Governments to reevaluate the economic policies and rural economic growth. Till now rural economy is only known as agricultural economy and never emphasized on add-on value products. Governments have to consider growing and generating rural employment. Target set for 2015 to eradicate poverty may not be achieved until we understand roots and real causes of poverty. Why child goes to work? This situation is most urgent to be taken care!!! Child goes to work only when parents allow. And why parents seek own child's support to sustain home economy? This is what in my opinion Governments need to understand and bring policies in accordance. Arresting child labor in factories have opened many sectors for them to get involved specially in flesh trade, begging, street entertainment, pick pocketing and robbery etc.  Law is effective as long as resources are open to children for education and for parents earn at least minimum to run a home. Law can only make this situation illegal but help is less towards reform to eliminate child labor. http://www.sadashivan.com/ (Child labour and society)
Child prostitute and trafficking estimated numbers country vise: ECPAT International
In Thailand- research group the Protection Project estimate the number of child victims of prostitution to be at least 80,000 but likely to be in the hundreds of thousands ,
In Sri Lanka, The government itself estimates there are approximately 30,000 children involved.
In Taiwan, between 40,000 and 60,000 children are sex workers ,
In China, the estimates range from 200,000 to 500,000 ,
In Brazil, the estimates range from 500,000 to 2 million ,
In the Dominican Republic, an estimated 25,000 ,
In West Africa, an estimated 35,000 ,
In Bangladesh, An estimated 13,000 children in Bangladesh are prey to the commercial sex industry of the country. More than 20,000 children are born and live in the 18 registered red-light areas of Bangladesh. Country-by-Country Reports Child Prostitution (gvnet.com)
In the United States, The US Department of Justice estimates the numbers to be between 100,000 and 3 million. These figures include children involved in prostitution, child pornography and who have been trafficked into the United States. ECPAT International

Commercial Sexual Exploitation of Children is on the rise see links to the report:-
In India - 400,000 child prostitutes in India and their number is increasing by the day, according to the department of women and child development. Cops turn their back on rise of child prostitution (Indian express),
In Sri Lanka - According to media and NGOs, nearly 100,000 Children are involved in child prostitution in Sri Lanka. According to various media and specialised organisations, it is estimated that there is a minimum of 150,000 child labourers in Sri Lanka. Ilankai Tamil Sangam (Sangam.org).   
In Australia - canberra, (Reuters) - Child prostitution is on the rise in Australia with an estimated 4,000 children as young as 10 selling sex for money and drugs. Child prostitution on rise in Australia -report(scholieren.nrc.nl)
In Ethiopian - Child prostitution in the Ethiopian capital Addis Ababa is “increasing at an alarming rate”, according to a study by Save the Children-Denmark (SCD). irinnews.org- Child prostitution on the rise, report says
In Brazil - Brazilian Center for Childhood and Adolescence (CBIA) has recently estimated that there are about 500,000 girls who have turned to prostitution to earn a living. Some of these girls are as young as nine years old. pangaea.org-CHILD PROSTITUTION ON THE RISE IN BRAZIL
In Vietnam - Child prostitution is on the rise in Vietnam. Nyung’s story is just one of many of thousands. Some estimates put the number of child prostitutes in Vietnam as high as 40,000. Radio Singapore International-child prostitution.
In world (ILO) - The International Labor Organization estimates that more than 2 million children under age 18 are involved in prostitution, half of them in Asia and 300,000 in the United States. Americans account for 80 percent of world arrests involving child sex tourism.graphic.pepperdine.edu-Child prostitution crisis surges worldwide.

(Newint.org) Street children, the facts - Who are these children?:- The usual image is of young homeless people who live and work on the streets. But it is better to think of street children in terms of their relationship to the street. Some come from street families. Others live mainly on the street but may go back to the family home in the evenings or make sporadic visits. Yet others sleep in night shelters.

Nearly 40 - 50% children among working-children are street children. These children survive by begging,  stealing, shoe polish,  street performance, collecting scraps, street selling and other. Some, particularly girls, get involved into the sex trade. The majority are on the streets in developing countries, mainly as a direct result of poverty mainly migrants from rural villages. They migrate with their parents and get involved into odd jobs as a result of worst economical condition of parents. And some percentage come alone to urban cities due to bad environment in their own village home. Major percentage of such children get addicted to use of drugs. Urban children who indulge as street children are 10% to 20% owing to family economical condition or unpleasant environment. Aggressive Movies and TV channel environment too has contributed spoiling children to source money through ugly street  jobs for drug addiction, become street children. Also friend circle or family alcoholic habit stimulates children to taste such life. Worst distressed are girls who are either sold to pimps or are sent for garbage collection, street performance or street begging.  In developing countries, girl child is considered as disgrace in poor illiterate orthodox uncivilized families. Nearly half of street beggars and garbage collectors are girl children. (Only my views observing and contacting urban and rural street children, may not be accurate)
Definitions street children by  UNICEF, defines street children into two main categories:
1. Children on the street are those engaged in some kind of economic activity ranging from begging to vending. Most go home at the end of the day and contribute their earnings to their family. They may be attending school and retain a sense of belonging to a family. Because of the economic fragility of the family, these children may eventually opt for a permanent life on the streets.

2. Children of the street actually live on the street (or outside of a normal family environment). Family ties may exist but are tenuous and are maintained only casually or occasionally.

Estimates vary but one often-cited figure is that the number of children living independently in the streets totals between 100 million and 150 million worldwide, and it is forecasted that - by 2020 – the number will increase to 800 million. Wikipedia-Street_children.
Street children facts and figure web links:
Street-Children(Encyclopędia Britannica) :- An estimated 100 million children and youths between the ages of 5 and 18 spend the major part of their lives in the city streets of the less developed world. Most of these "street children," as they have come to be known, work "on" the street. They live at home but are forced into the streets to contribute to their families' meagre incomes in whatever way they can: by shining shoes. Britannica Ultimate DVD-ROM or CD-ROM 2007 .
apa.org-Facts and figures  - Ten to 30 million children worldwide are orphaned and must support themselves by working, begging, stealing, selling sex and trafficking illicit substances. Estimates say that up to 90 percent of these street children use substances of one kind or another. The initial use of a substance among street children is known to be as early as age 5.
U.S. Congress Cites Growing World Problem of "Street Children":- More than 100 million children worldwide are living hand-to-mouth, bereft of family and homes, and are "particularly vulnerable to abuse" in countries as wide-ranging as Uganda, Zimbabwe, Brazil and the Philippines, Representative Christopher Smith, chairman of the U.S. House of Representatives Africa Subcommittee said September 13. between 32,000 and 52,000 children known as "night commuters" travel from war-torn areas of Uganda "each night to urban centers to avoid abduction by the Lord's Resistance Army," a rebel movement that has battled the central government for more than 10 years. Democratic Republic of Congo, Denehy said, "between 25,000 and 50,000 child refugees, war orphans and other children, widely perceived to be street thugs, are accused of witchcraft or sorcery. They live on the streets throughout the country, and engage in petty crime, begging and/or prostitution." For Africa, Alton gave the following figures for street children: Kenya, 250,000; Ethiopia, 150,000; Zimbabwe, 12,000. And he said that many street children have been forced to serve as child soldiers, suffering death or terrible wounds. In the Democratic Republic of Congo (DRC), he said, the United Nations estimates that 30,000 children under the age of 12 are under arms, making up 10 percent of the armed groups in the region. At the same time, Alton said, "20,000 children are believed to live on the streets in the DRC capital, Kinshasa."
number of street children in Delhi: 150,000 estimate [BBC; Sep 2005]
Street children: the facts(findarticles.com):- South Africa-250,000 nationwide. Gambia - 45% of street children say they have been beaten on the street. Snapshots from Asia (9) - 150 million children work in the Asia Pacific area--104 million of them in hazardous forms of child labour. Asia has traditionally had high numbers of children on the streets. Bangladesh - Over 445,000; 75% of them in Dhaka. The numbers of boys and girls are almost evenly split. India - 11 million; Mumbai, Delhi and Calcutta each have over 100,000. China - 300,000, of whom half also sleep on the streets.
Visible and yet invisible - Street children(kindernothilfe.org):- The expression "street children" describes three different groups of girls and boys: * Children who work in the street during the day, but live with their families. * Children who work in the street during the week and go back to their families only at the weekend because their workplace is far from their homes. * Children who have no longer contact to their families. They live and work in the street. Approximately 80 million children belong to the last group. Many of them live in the cities of Latin America.. The youngest are only five years old. It is very difficult to collect exact figures but experts assume that the number of street children will continue to rise. This is based on the fact that more and more people are migrating from the country to cities. Soon every sixth resident of a city will be younger than eighteen.
childrenoftheandes.org-Street Children:- Colombia is a country traditionally associated with street children. The image of dirty and hungry children sleeping in cardboard boxes or under bridges has become a regrettably familiar one. The most reliable figures are from local city surveys: In 1999, 5,000 children where said to be living in the streets. Today the figure has risen to 30,000, a number validated by both the Colombian government (ICBF) and UNICEF.
kievstreetkids.org-Street children Statistics:- In the United States there is a crisis situation and Federal Government revealed that there are about 500,000 under-age runaways and 'throw-aways'. ("New York Times", 5 February 1990) Worldwide At least 100 million children worldwide are believed to live at least part of the time on the streets. . . These street children are first and foremost working children. (UNICEF, 29 March 1994). United Kingdom According to a 'Crisis' report half of the beggars on our streets spent their childhood in care and a quarter slept on the streets before they were 16. ("IDEA" Magazine of the Evangelical Alliance, January 1995). Nearly 100,000 young people go missing in Britain each year. (The Children's Society, "Young runaways", 1989)

click for video.Children performing roadside circus and earn to support parents