Vacuum extraction increases the risk for intracranial hemorrhage and subdural hematoma. These infants may have impaired suckling reflexes, delaying successful breastfeeding initiation. (Core Curriculum 2013, p. 489-490 3rd. ed.; Core Curriculum 2019, p. 369). In addition, women who have a vacuum extraction during birthing abandon breastfeeding early, possibly due to a long, stressful labor & infant injury (Hall et al, 2002), (Wambach, 2016 p 233; Wambach 2021 p 182).
Infantile seborrheic dermatitis, also known as cradle cap, is a non-itchy and non-painful condition that causes oily or crusty patches to form on an infant's scalp. It is common in newborns and does not affect lactation.
Fetal scalp monitoring may increase risk of cephalohematoma, which is a common minor result of vaginal labor. Kawakita, T., Reddy, U. M., Landy, H. J., Iqbal, S. N., Huang, C. C., & Grantz, K. L. (2016). Neonatal complications associated with use of fetal scalp electrode: a retrospective study. BJOG : an international journal of obstetrics and gynaecology, 123(11), 1797–1803. https://doi.org/10.1111/1471-0528.13817
While occiput posterior may lead to other complications of birth that could affect nursing, the position itself does not necessitate that there will be problems with nursing.