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Asano R, Tsuchiya KJ, Harada T, et al. Season of Birth Predicts Emotional and Behavioral Regulation in 18-Month-Old Infants: Hamamatsu Birth Cohort for Mothers and Children (HBC Study). Front Public Health. 2016;4:152doi: 10.3389/fpubh.2016.00152.
Asano, R., Tsuchiya, K. J., Harada, T., Kugizaki, Y., Nakahara, R., Nakayasu, C., Okumura, A., Suzuki, Y., Takagai, S., Mori, N., Takei, N. (2016). Season of Birth Predicts Emotional and Behavioral Regulation in 18-Month-Old Infants: Hamamatsu Birth Cohort for Mothers and Children (HBC Study). Frontiers in public health, 4152. https://doi.org/10.3389/fpubh.2016.00152
Asano, Ryosuke, et al. "Season of Birth Predicts Emotional and Behavioral Regulation in 18-Month-Old Infants: Hamamatsu Birth Cohort for Mothers and Children (HBC Study)." Frontiers in public health vol. 4 (2016): 152. doi: https://doi.org/10.3389/fpubh.2016.00152
Asano R, Tsuchiya KJ, Harada T, Kugizaki Y, Nakahara R, Nakayasu C, Okumura A, Suzuki Y, Takagai S, Mori N, Takei N. Season of Birth Predicts Emotional and Behavioral Regulation in 18-Month-Old Infants: Hamamatsu Birth Cohort for Mothers and Children (HBC Study). Front Public Health. 2016 Jul 25;4:152. doi: 10.3389/fpubh.2016.00152. eCollection 2016. PMID: 27504441; PMCID: PMC4958653.
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Front Public Health. 2016 Jul 25;4:152. doi: 10.3389/fpubh.2016.00152. eCollection 2016.

Season of Birth Predicts Emotional and Behavioral Regulation in 18-Month-Old Infants: Hamamatsu Birth Cohort for Mothers and Children (HBC Study).

Frontiers in public health

Ryosuke Asano, Kenji J Tsuchiya, Taeko Harada, Yumeno Kugizaki, Ryuji Nakahara, Chikako Nakayasu, Akemi Okumura, Yukiko Suzuki, Shu Takagai, Norio Mori, Nori Takei,

Affiliations

  1. Research Center for Child Mental Development, Hamamatsu University School of Medicine, Hamamatsu, Japan; Department of Child Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University and University of Fukui, Hamamatsu, Japan.
  2. Research Center for Child Mental Development, Hamamatsu University School of Medicine , Hamamatsu , Japan.
  3. Research Center for Child Mental Development, Hamamatsu University School of Medicine, Hamamatsu, Japan; Department of Child Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University and University of Fukui, Hamamatsu, Japan; Department of Psychiatry, Hamamatsu University School of Medicine, Hamamatsu, Japan.
  4. Research Center for Child Mental Development, Hamamatsu University School of Medicine, Hamamatsu, Japan; Department of Child Development, United Graduate School of Child Development, Osaka University, Kanazawa University, Hamamatsu University School of Medicine, Chiba University and University of Fukui, Hamamatsu, Japan; Division of Psychological Medicine, Institute of Psychiatry, King's College London, London, UK.

PMID: 27504441 PMCID: PMC4958653 DOI: 10.3389/fpubh.2016.00152

Abstract

BACKGROUND: Previous research has demonstrated that the season of birth may predict development of emotional and behavioral regulation during childhood or adolescence. This study examined whether the season of birth predicts effortful control (i.e., the ability to voluntarily choose course of actions during conflict and to plan for the future) and aggression (i.e., the use of physical force and expression of anger toward others) in 18-month-old infants.

METHODS: Participants included 885 infants who were enrolled in the Hamamatsu Birth Cohort for Mothers and Children in Hamamatsu, Japan. Seasons of birth were categorized into winter (December, January, and February), spring (March, April, and May), summer (June, July, and August), and autumn (September, October, and November). At 18 months of age, effortful control was assessed using the Early Childhood Behavior Questionnaire, and aggression was measured using the Cardiff Infant Contentiousness Scale. Structural equation modeling analysis with measurement and structural equations was conducted to test our prediction.

RESULTS: Effortful control was higher in infants born in spring [B = 0.095, 95% CI (0.014 to 0.175), p = 0.021, β = 0.146] and summer [B = 0.078, 95% CI (0.001 to 0.156), p = 0.049, β = 0.118] than in those born in winter. In addition, aggression was lower in those born in spring [B = -0.286, 95% CI (-0.551 to -0.021), p = 0.035, β = -0.135] than those born in winter, even after controlling for seven covariates.

CONCLUSION: The findings suggest that season of birth may determine development of emotional and behavioral regulation skills during early infancy. Future research should pay more attention to the underlying mechanisms of the effects of birth season on development of emotional and behavioral regulation during infancy.

Keywords: Japan; aggression; birth cohort; effortful control; infancy; season of birth; structural equation modeling

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