However, for-profit day care corporations often exist where the market is sufficiently large or there are government subsidies. For instance, in North America, KinderCare Learning Centers, one of the largest of such companies, has approximately 1,600 centers located in 39 states and the District of Columbia. Bright Horizons Family Solutions another of the largest has over 600 daycare centers. Similarly the Australian government's childcare subsidy has allowed the creation of a large private-sector industry in that country.
State legislation may regulate the number and ages of children allowed before the home is considered an official daycare program and subject to more stringent safety regulations. Often the nationally recognized Child Development Associate credential is the minimum standard for the individual leading this home care program. Each state has different regulations for teacher requirements. In some states, teachers must have an associate degree in child development. States with quality standards built into their licensing programs may have higher requirements for support staff such as teacher assistants. And in Head Start programs, by 2012, all lead teachers must have a bachelor's degree in Early Childhood Education. States vary in the standards set for daycare providers, such as teacher to child ratios.
Spain provides paid maternity leave of 16 weeks with 30-50% of mothers returning to work (most full-time) after this, thus babies 4 months of age tend to be placed in daycare centers. Adult-infant ratios are about 1:7-8 first year and 1:16-18 second year. Public preschool education is provided for most children aged 3–5 years in "Infantil" schools which also provide primary school education.