{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T13:59:56Z","timestamp":1789912796643,"version":"4.0.1"},"reference-count":35,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2012,8,6]],"date-time":"2012-08-06T00:00:00Z","timestamp":1344211200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Developmental Psychobiology"],"published-print":{"date-parts":[[2013,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:label\/><jats:p>The current study explored whether birth timing, known to influence the mother\u2013infant relationship, also affected infant physiology up to 9 months later and infant behavior at weaning. Infant blood samples were collected at 5.75 and 8.75 months of age to assess functioning of the hypothalamic\u2013pituitary\u2013adrenal axis as well as the antibody response to a Cholera vaccination. Path analysis indicated infants born late in the birth season had less <jats:italic>Relaxed<\/jats:italic> relationships with their mothers. A less\u2010<jats:italic>Relaxed<\/jats:italic> relationship was associated with greater infant <jats:italic>Positive Engagement<\/jats:italic> and <jats:italic>Distress<\/jats:italic>, which were negatively correlated, suggesting infants may have different strategies of coping with this type of relationship. Low <jats:italic>Relaxed<\/jats:italic> scores were also associated with higher infant cortisol concentrations at 5.75 months, which was associated with a reduced immune response to a vaccination 3 months later. Together these results indicate that the influence of birth timing on the mother\u2013infant relationship may have consequences for infant development. \u00a9 2012 <jats:italic>Wiley Periodicals, Inc<\/jats:italic>. Dev Psychobiol 55: 829\u2013837, 2013.<\/jats:p><\/jats:sec>","DOI":"10.1002\/dev.21074","type":"journal-article","created":{"date-parts":[[2012,8,6]],"date-time":"2012-08-06T14:04:00Z","timestamp":1344261840000},"page":"829-837","source":"Crossref","is-referenced-by-count":4,"title":["Birth timing and the mother\u2013infant relationship predict variation in infant behavior and physiology"],"prefix":"10.1002","volume":"55","author":[{"given":"Jessica J.","family":"Vandeleest","sequence":"first","affiliation":[{"name":"California National Primate Research Center University of California\u2010Davis One Shields Avenue Davis CA 956167 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sally P.","family":"Mendoza","sequence":"additional","affiliation":[{"name":"California National Primate Research Center University of California\u2010Davis One Shields Avenue Davis CA 956167 USA"},{"name":"Department of Psychology University of California Davis 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