In 2008, a combination of the triplet surveys at age 1 and 2 was sent to mothers of all triplets. Since 2009, the combined survey 1 and 2 served as the first survey for newly registered triplets. The combined survey comprises items on pregnancy, gestational age, smoking and alcohol consumption during pregnancy, mode of delivery, breastfeeding, attaining miles stones, and growth.

Subject age
  • 12 months - 24 months
Time span From 2008-01-01 (ongoing)
Geographic location NL
Dorret I. Boomsma
Vrije Universiteit Amsterdam
YNTR administration
Vrije Universiteit Amsterdam
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