title: Family and infant characteristics associated with timing of core and non-core food introduction in early childhood.
abstract: OBJECTIVE
  To identify family and infant characteristics associated with timing of introduction of two food types: core foods (nutrient-dense) and non-core foods (nutrient-poor) in a population-based sample of mothers and infants.
  
  
  METHODS
  Participants were 1861 mothers and infants from the Gemini twin birth cohort (one child per family). Family and infant characteristics were assessed when the infants were around 8 months old. Timing of introducing core and non-core foods was assessed at 8 and 15 months. As the distributions of timing were skewed, three similar-sized groups were created for each food type: earlier (core: 1-4 months; non-core: 3-8 months), average (core: 5 months; non-core: 9-10 months) and later introduction (core: 6-12 months; non-core: 11-18 months). Ordinal logistic regression was used to examine predictors of core and non-core food introduction, with bootstrapping to test for differences between the core and non-core models.
  
  
  RESULTS
  Younger maternal age, lower education level and higher maternal body mass index were associated with earlier core and non-core food introduction. Not breastfeeding for at least 3 months and higher birth weight were specifically associated with earlier introduction of core foods. Having older children was specifically associated with earlier introduction of non-core foods.
  
  
  CONCLUSIONS
  There are similarities and differences in the characteristics associated with earlier introduction of core and non-core foods. Successful interventions may require a combination of approaches to target both food types.
authors.affiliation: Health Behaviour Research Centre, Department of Epidemiology and Public Health, University College London, London, UK.
authors.forename: S
authors.initials: S
authors.lastname: Schrempft
authors.forename: C H M
authors.initials: CH
authors.lastname: van Jaarsveld
authors.forename: A
authors.initials: A
authors.lastname: Fisher
authors.forename: J
authors.initials: J
authors.lastname: Wardle
mesh_terms: D000328:Adult; D000367:Age Factors; D001724:Birth Weight; D015992:Body Mass Index; D002657:Child Development; D015331:Cohort Studies; D004522:Educational Status; D004739:England; D005191:Family Characteristics; D005247:Feeding Behavior; D005260:Female; D063427:Food Quality; D006801:Humans; D007223:Infant; D018730:Infant Behavior; D007225:Infant Food; D007227:Infant Nutritional Physiological Phenomena; D008297:Male; D009035:Mothers; D012189:Retrospective Studies; D035781:Siblings; D014852:Wales