Population-based reference for birth weight for gestational age in northern China

Area of Science:

• Neonatal research
• Pediatric growth standards
• Public health surveillance

Background:

• Localized birth weight references are crucial for assessing infant growth and identifying atypical birth outcomes like small for gestational age.
• Current standards are unavailable for Mainland China, hindering accurate clinical diagnosis and regional epidemiological studies.
• Establishing region-specific references is essential for precise evaluation of birth outcomes.

Purpose of the Study:

• To develop up-to-date, sex- and parity-specific birth weight references.
• To utilize a large dataset of 231,937 births in Taiyuan, China (2005-2011).
• To provide essential tools for clinical and epidemiological assessments in Mainland China.

Main Methods:

• A population-based, cross-sectional study design was employed.
• Data included 231,937 healthy infants born in Taiyuan between 2005 and 2011.
• Birth weight and gestational age were determined using last menstrual period and ultrasound data.

Main Results:

• Sex-specific birth weight references were generated for male and female infants.
• Parity-specific references were created for infants of primiparous and multiparous mothers.
• Male infants showed higher birth weights than females from week 33, and infants of multiparous mothers weighed more from week 36.

Conclusions:

• The Taiyuan birth weight references show growth trends similar to international standards but indicate slower growth compared to European/North American infants.
• Growth patterns are comparable to those observed in other Asian countries.
• These references are vital for accurate clinical assessment and epidemiological research in China.