Child care eats a terrifying proportion of the family budget, and many childminders are untrained.
The Labour leader said there was "nothing wrong with anyone employing Polish builders, Swedish childminders or French chefs".
Should the ban on corporal punishment in schools be extended to childcare centres, childminders and non-publicly funded pre-school centres?
Nurseries, childminders, playgroups, breakfast and holiday clubs in London took part in a survey for childcare charity the Daycare Trust.
"Parents of young children will be concerned if their childminders or nursery workers do not have sufficient skills, " he said.
Physical punishment is outlawed already in UK schools, but not in the home - and not for childminders, with parental consent.
Home-based childminders would be allowed to look after two babies under one, instead of one as currently, and four one-to-five-year-olds, up from three.
BBC: Childcare ratios: We will find way forward, says Cameron
Health Minister Lesley Griffiths told AMs that childminders, leisure centres and small shops selling only packaged sweets and drinks would be exempt from the legislation.
Government plans to allow nursery staff and childminders to look after more children have drawn "a huge and angry response" from parents, says a charity.
BBC: Huge and angry response to childcare plans, says charity
Earlier this year the ministers announced plans to allow nurseries and childminders to look after more children, but only if there is a qualified graduate present.
Nurseries and childminders in England are to be allowed to look after more children per adult in an attempt to cut childcare costs and boost standards.
The authors advised parents to discuss sleep positions with childminders.
This confidentiality arrangement follows consultations with 70, 000 parents and childminders.
BBC: NEWS | UK | Education | Childminder reports to go online
Of these, 68, 200 are childminders and 31, 100 were daycare providers.
BBC: NEWS | UK | Education | Childminder reports to go online
In a move backed by ASH, the National Childminding Association (NCA) has called for the reversal of government regulations which allow childminders to smoke in front of children if parents give permission.
There are separate changes for childminders.
BBC: Huge and angry response to childcare plans, says charity
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