CHErIsH parent and child outcome measures and time points
| Outcome | Measure | Tp1 | Tp2 | Tp3 |
| Parent demographic information | Self-report items and medical records. | ✓ | ✓ | ✓ |
| Infant characteristics | Self-report items and medical records. | ✓ | ✓ | ✓ |
| Feeding practices | Self-report items about breast feeding, formula feeding, complementary feeding and feeding environment. | ✓ | ✓ | ✓ |
| Child dietary intake | Parent rating of frequency of child consumption of prespecified foods. | ✓ | ✓ | |
| Child feeding preferences | Parent report of child liking of foods included in the dietary intake report by indicating ‘yes’, ‘no’ or ‘never tried’ (adapted version of the approach of Denney-Wilson et al.72 89) | ✓ | ✓ | |
| Infant feeding styles | The restrictive, pressuring and responsive subscales of the Infant Feeding Styles Questionnaire.73 | ✓ | ✓ | ✓ |
| Knowledge and self-efficacy | The self-efficacy subscale of Maternal Knowledge and Self-Efficacy scale.74 | ✓ | ✓ | ✓ |
| Infant feeding-related healthcare costs | Adapted Client Resource Use Questionnaire.75
Parents will also be asked about feeding-related HCP engagement and child medicine use. | ✓ | ✓ | ✓ |
| Parent HRQoL | The standardised EQ-5D-5L76 and the ICE-CAP.77 | ✓ | ✓ | ✓ |
| Parent stress | The perceived Stress Scale.78 | ✓ | ✓ | ✓ |
| Parent intervention feedback | Open-ended question on parental thoughts about acceptability, suitability and comprehensiveness of study and intervention procedures. | ✓ | ✓ | |
| Fidelity checklist | Self-report checklist of intervention receipt and enactment. | ✓ | ✓ | |
| Infant biomarker samples | Infant urine and stool samples. | ✓ | ✓ | ✓ |
| Parental biomarker samples | Parental saliva samples and breast milk samples* | ✓ | ✓ | ✓ |
Tp1, baseline, prior to infant’s 2 month vaccination visit; Tp2, by the infant’s 6 month vaccination visit; Tp3, at infant’s 13 month vaccination visit.
↵*Sample collected only from breastfeeding mothers.
CHErIsH, Choosing Healthy Eating for Infant Health; HCP, healthcare professional; HRQoL, health-related quality of life.