Child variables and biological specimens collected in questionnaires and clinic visits
| Variables | 3 months | 6 months | 1 year | 2 years | 3 years | 5 years | 8 years |
| Health and development | X | X | X | X | X | X | |
| Occupation | X | X | X | X | X | X | |
| Childcare | X | X | X | X | X | X | |
| Vaccines | X | ||||||
| Child food and liquid intake | X | X | X | X | X | X | |
| Children’s eating and drinking behaviours | X | X | |||||
| Children’s activities | X | X | |||||
| Children’s injuries | X | ||||||
| Community | X | ||||||
| Children’s education | X | ||||||
| General infant behaviours | |||||||
| Infant Behavior Questionnaire (IBQ) | X | X | X | X | |||
| Scales of Independent Behaviors (SIB-R) | X | X | X | X | X | X | |
| Fussing and crying | X | X | X | X | |||
| Sleeping | X | X | X | X | X | X | |
| Early Childhood Behavior Questionnaire (ECBQ) | X | ||||||
| Children’s Behavior Questionnaire (CBQ) | X | ||||||
| Child Behaviour Checklist Ages 1.5–5 (CBCL) | X | X | |||||
| Behaviour Rating Inventory of Executive Function—Preschool (BRIEF-P) | X | X | |||||
| Ages and Stages Questionnaire—Third Edition (ASQ-3) | X | ||||||
| Children’s Communication Checklist—Second Edition (CCC-Q) | X | ||||||
| Behaviour Assessment System for Children—Second Edition (BASC-2) | X | X | |||||
| Media use | X | X | |||||
| Quantitative Checklist for Autism in Toddlers | X | X | |||||
| Temper Tantrum Scale—past 2 weeks | X | X | |||||
| Temper Tantrum Scale—past 6 months | X | X | |||||
| Parenting | X | X | |||||
| Biological specimens | |||||||
| Buccal cells | X | ||||||
| Venous blood | X |