Table 1. Timing of measurement of early-life exposure variables.

Early-life exposure	Time point
	In utero	Birth to 6 months	38 months	57 months
Maternal smoking	×
Paternal smoking	×
Breastfeeding		×
Age at introduction to solids		×
Dietary patterns (junk, health, traditional, fussy/snack)			×
Time spent in car			×
Time spent watching television			×
Frequency playing computer games				×