For example, an increasing number of countries has implemented an integrated curriculum in their ECEC programmes from age 1 to entry to compulsory education, which highlights that ECEC services for children under the age of 3 have expanded in most countries in response to a growing demand for better learning outcomes, as well as growing female labour force participation (OECD, 2011b). These two averages mask wide variations across countries, but a similar pattern emerges when the two series are analysed together. In countries where mothers’ labour market participation is the highest, such as Denmark, Luxembourg, the Netherlands, Portugal, Slovenia and Switzerland (above 70% employment among women aged 15 to 64 w ith their youngest child under the age of 3), high proportions of children are enrolled in formal childcare (ISCED 0 and other registered services).