Tobias JH, et al. – In this study involving nearly 2,000 participants from the UK prospective birth cohort, researchers assessed associations between breech presentation at onset of labor with tibia and hip bone outcomes at 17 years of age among participants. They noted an association of breech presentation (n=102) with lower tibial cortical bone mineral content (BMC; − 0.14SD), cross-sectional area (CSA; − 0.12SD), bone mineral density (− 0.16SD), periosteal circumference (− 0.14SD), and cross-sectional moment of inertia (− 0.11SD) in models adjusted for sex, age, maternal education, smoking, parity, and age, singleton/multiple births. They also observed a relation of breech presentation with lower hip CSA (− 0.24SD, − 0.43 to 0.00) in females only. Prenatal skeletal loading may exert long-lasting effects on skeletal size and strength but require replication, according to findings.