Intergenerational effects on size at birth in South India

Area of Science:

• Human genetics and developmental biology
• Maternal and child health
• Anthropometry and growth studies

Background:

• Intergenerational studies show parental size influences offspring birthweight.
• Maternal environment and genetics are key factors in birth size.
• Limited intergenerational data exists from India.

Purpose of the Study:

• To investigate intergenerational influences on birth size in an Indian population.
• To analyze the impact of parental birthweight, length, height, and BMI on offspring size at birth.
• To examine maternal versus paternal contributions to offspring birth characteristics.

Main Methods:

• Utilized historical birth records from Holdsworth Memorial Hospital (HMH), Mysore, South India (since 1934).
• Analyzed 468 mother-offspring and 341 father-offspring pairs.
• Employed regression analysis to assess parental factors' impact on offspring birthweight, length, and head circumference.

Main Results:

• Offspring born 1990-95 were heavier than their parents, with a mean increase of 121g.
• Both parental birthweights equally predicted offspring birthweight (beta ≈ 253 g/kg).
• Maternal BMI significantly impacted offspring birthweight more than paternal BMI; paternal height influenced offspring length more than maternal height.

Conclusions:

• Birth size is a product of combined genetic and environmental factors.
• Both maternal and paternal birthweights are significant predictors of offspring size.
• Maternal nutritional status and paternal factors contribute distinctly to offspring size and skeletal development.