Study design
The population of the study consists of all children born in the Hospital District of Southwest Finland between 2008 and 2010 (n=14946). This group is followed up unidentified from register data.
—> From this population, at the time of recruitment 1,797 mothers and 1,658 of their spouses joined to the Steps to the healthy development and well-being of children follow-up study. The follow-up group will be followed up in STEPS study through questionnaires, visits and biological samples.