Babies born via C-section have worse immune systems
Multiple systematic reviews and microbiome studies indicate that cesarean section delivery alters initial microbial colonization, which plays a critical role in shaping the developing infant immune system and is associated with a higher risk of immune-mediated disorders.
The retrieved papers consistently demonstrate that cesarean section delivery alters early-life microbial colonization (gut and skin), which is known to be a crucial driver of immune system development and maturation. Multiple reviews and observational studies link these cesarean-induced microbial shifts to increased susceptibility to immune-related conditions like allergies, asthma, and inflammatory disorders, thus supporting the claim.
M. Nash, D. Frank, J. Friedman. Early Microbes Modify Immune System Development and Metabolic Homeostasis—The “Restaurant” Hypothesis Revisited. 2017. https://doi.org/10.3389/fendo.2017.00349
The paper discusses how cesarean sections alter offspring microbiota composition, potentially impacting long-term immune health.
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Á. Moya-Pérez, Pauline Luczynski, I. Renes, Shugui Wang, Y. Borre, C. Anthony Ryan, J. Knol, C. Stanton, T. Dinan, J. Cryan. Intervention strategies for cesarean section–induced alterations in the microbiota-gut-brain axis. 2017. https://doi.org/10.1093/nutrit/nuw069
It links mode of delivery and subsequent microbial alterations to the development of immune-related conditions like asthma and allergies.
F. Inchingolo, A. Inchingolo, Irene Palumbo, I. Trilli, M. Guglielmo, A. Mancini, A. Palermo, A. Inchingolo, G. Dipalma. The Impact of Cesarean Section Delivery on Intestinal Microbiota: Mechanisms, Consequences, and Perspectives—A Systematic Review. 2024. https://doi.org/10.3390/ijms25021055
This review highlights how cesarean section delivery leads to distinct microbial compositions linked to immune-related disorders.
Negin Shaterian, Fatemeh Abdi, Nooshin Ghavidel, Farzane Alidost. Role of cesarean section in the development of neonatal gut microbiota: A systematic review. 2021. https://doi.org/10.1515/med-2021-0270
It demonstrates that cesarean section-born infants exhibit different gut colonization patterns, which contribute to immune system development differences.
Eun Lee, Byoung-ju Kim, M. Kang, K. Choi, Hyun‐Ju Cho, Yeongho Kim, Song-I Yang, Y. Jung, Hyung-Young Kim, Ju-Hee Seo, J. Kwon, Hyo-Bin Kim, So-Yeon Lee, S. Hong. Dynamics of Gut Microbiota According to the Delivery Mode in Healthy Korean Infants. 2016. https://doi.org/10.4168/aair.2016.8.5.471
The study notes that delivery mode alters early gut microbiota dynamics, which are known to affect immune and allergic disease risks.
G. Catassi, Sandra García Mateo, A. S. Occhionero, C. Esposito, V. Giorgio, Marina Aloi, Antonio Gasbarrini, Giovanni Cammarota, G. Ianiro. The importance of gut microbiome in the perinatal period. 2024. https://doi.org/10.1007/s00431-024-05795-x
It reiterates that delivery methods influence microbiome composition and diversity, which have significant implications for immune system development.
N. Nunez, Louis Réot, E. Menu. Neonatal Immune System Ontogeny: The Role of Maternal Microbiota and Associated Factors. How Might the Non-Human Primate Model Enlighten the Path?. 2021. https://doi.org/10.3390/vaccines9060584
It outlines how mode of delivery influences infant microbiota and subsequently the ontogeny and maturation of the immune system.
Alejandro Borrego-Ruiz, Juan J. Borrego. Early-life gut microbiome development and its potential long-term impact on health outcomes. 2025. https://doi.org/10.20517/mrr.2024.78
The review notes that cesarean delivery-induced gut dysbiosis can alter developmental programming and predispose individuals to immune and inflammatory conditions.
Gao Long, Yuting Hu, Enfu Tao, Bo Chen, Xiaoli Shu, Wei Zheng, Mizu Jiang. The Influence of Cesarean Section on the Composition and Development of Gut Microbiota During the First 3 Months of Life. 2021. https://doi.org/10.3389/fmicb.2021.691312
It establishes that cesarean section significantly disrupts normal gut colonization patterns during the first months of life.
Eleni Dubé-Zinatelli, E. Mayotte, Luna Cappelletti, Nafissa Ismail. Impact of the maternal microbiome on neonatal immune development.. 2025. https://doi.org/10.1016/j.jri.2025.104542
It discusses how the absence of vaginal microbiome exposure during cesarean delivery has potential long-term implications for offspring immunity.
Aditya Jain, Revat J Meshram, Sham Lohiya, Ankita Patel, Divyanshi Kaplish. Exploring the Microbial Landscape of Neonatal Skin Flora: A Comprehensive Review. 2024. https://doi.org/10.7759/cureus.52972
It emphasizes that the mode of delivery impacts microbial establishment, influencing foundational immune system development.
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