title: Natural odour preferences of newborn infants change over time.
abstract: At their first sucking contact, neonates prefer an unwashed breast to a washed one, but an amniotic fluid (AF)- treated breast over a "natural odour" breast. We examined the development of these neonatal olfactory preferences. On days 3-4 significantly more babies still selected their mother's unwashed breast (n = 21) than the washed alternative (n = 8). Preferences for natural breast odours were more pronounced for girls than boys. In a subsequent experiment comprising another 28 babies, the number of babies who selected a naturally scented (n = 9) vs an AF-treated breast (n = 19) on days 2-5 were not reliably different. However, babies who selected the natural breast had longer pre-test maternal contact and had spent more time breastfeeding. Ten babies who chose the AF breast in the latter experiment were tested in the same manner several days later; all preferred the naturally smelling breast. While preferences for AF fade after birth, responsiveness to natural breast odours may be enhanced by postnatal experience.
authors.affiliation: Department of Paediatrics, Tartu University, Estonia.
authors.forename: H
authors.initials: H
authors.lastname: Varendi
authors.forename: R H
authors.initials: RH
authors.lastname: Porter
authors.forename: J
authors.initials: J
authors.lastname: Winberg
mesh_terms: D000653:Amniotic Fluid; D001942:Breast Feeding; D002755:Choice Behavior; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007231:Infant, Newborn / Q000523:psychology*; D008297:Male; D009034:Mother-Child Relations; D009812:Odorants; D012903:Smell