Bone mass in newborns and its predictors.

Area of Science:

• Obstetrics and Gynecology
• Pediatrics
• Bone Health Research

Background:

• Optimal bone mass accrual during fetal development is vital for lifelong skeletal health and osteoporosis prevention.
• Understanding factors influencing newborn bone mass (NBBM) is essential for early intervention strategies.

Purpose of the Study:

• To describe newborn bone mass (NBBM) in a cohort of term newborns.
• To identify maternal and fetal factors associated with NBBM.

Main Methods:

• An observational study involving singleton pregnant women up to 16 weeks gestation.
• Measurements included maternal diet, fetal femoral volume (FFV) via ultrasound, serum 25-hydroxyvitamin D, placental weight, and newborn bone mineral content (BMC), bone mineral density (BMD), and bone area using DXA.
• Statistical analysis explored associations between maternal/fetal factors and NBBM.

Main Results:

• The mean BMC, BMD, and bone area for term newborns were determined.
• Significant univariable associations with NBBM included gestational age, gestational weight gain, FFV at 19 weeks, placental weight, third-trimester maternal serum albumin, and newborn anthropometrics.
• Multivariable analysis identified newborn birth weight, placental weight, and FFV at 19 weeks as significant predictors of NBBM.

Conclusions:

• This study provides descriptive data on NBBM in term newborns.
• Birth weight, second-trimester fetal femoral volume, and placental weight are significant associated factors for newborn bone mass.