[Smoking during pregnancy: trends between 2001 and 2010].

Objective: To establish trends in the prevalence of smoking during pregnancy between 2001 and 2010 and to relate these to differences in educational gradient in the Netherlands.

Design: National surveys.

Method: In 2001, 2002, 2003, 2005, 2007 and 2010, 28,720 questionnaires were handed out to mothers with infants aged up to 6 months at periodic check-ups at well baby clinics.

[Passive smoking in young children in the Netherlands sharply decreased since 1996].

Objective: To describe the prevalence of passive smoking in young children and to analyse the trends in the prevalence of passive smoking in young children over time.

Design: Retrospective, descriptive.

Method: Data were derived from yearly samples of 500 to 800 adults living with children aged 0-4 years, who had completed a questionnaire on passive smoking and on several background characteristics.