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Thymus size is associated with breastfeeding and having pets in a sex-specific manner

Rikke P Laursen1, Anni Larnkjaer1, Christian Ritz1

  • 1Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark.

Acta Paediatrica (Oslo, Norway : 1992)
|October 14, 2019
PubMed

Insights

Thymus size in infants is linked to sex and breastfeeding for girls, and household pets for boys. These sex-specific thymus size associations warrant further investigation in future research.

Area of Science:

  • Pediatric immunology
  • Infant health
  • Developmental biology

Background:

  • The thymus plays a crucial role in immune system development.
  • Factors influencing thymus size in infancy are not fully understood.
  • Early life exposures may impact immune maturation.

Purpose of the Study:

  • To investigate associations between thymus size and various factors in healthy Danish infants aged 8-13 months.
  • To explore relationships with anthropometric measurements, sex, age, breastfeeding, siblings, pets, and infections/allergies.
  • To identify potential determinants of thymus size during early infancy.

Main Methods:

  • Utilized data from 256 infants in the ProbiComp study.
  • Assessed thymus size using sonographic measures.
  • Calculated thymic index (TI) and thymus weight index (TWI) for volume estimation.

Main Results:

  • Boys exhibited larger thymus size (TI and TWI) compared to girls (P < .001, P < .02).
  • Breastfeeding was associated with larger thymus weight index (TWI) in girls (P = .01).
  • Presence of household pets correlated with larger thymic index (TI), particularly in boys (P = .02).

Conclusions:

  • Thymus size in infants shows sex-specific associations with breastfeeding (girls) and pet ownership (boys).
  • These findings highlight the influence of environmental and biological factors on early immune development.
  • Further research is recommended to explore these sex-specific relationships in thymus size determination.
Abstract

Keywords:
breastfeedinginfantssex differencesthymus size

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