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Neonatal: Macrosomic neonates are at risk for shoulder dystocia and birth trauma. This risk is directly related to neonatal birth weight and begins to increase substantially when birth weight exceeds 4500 g and particularly when it exceeds 5000 g. Brachial plexus injury is rare, with an incidence of fewer than 2 cases per 1000 vaginal deliveries. This risk is approximately 20 times higher when the birth weight is more than 4500 g (McFarland, 1986). Mulik et al reported a higher incidence of NICU admissions for neonates with a birth weight higher than 4500 g compared with newborns with a birth weight of less than 4000 g (9.3% vs 2.7%). Risk of shoulder dystocia was 10 times higher in the larger babies (4.1% vs 0.4%).
is one such one that refers to size being an issue with shoulder dystocia. In fact, if you google shoulder dystocia causes, there are many articles that come up indicating that a large fetus is a risk factor.