Human breast milk (HBM) is considered the gold standard for infant nutrition due to its optimal nutrient profile and complex composition of cellular and non-cellular components. Breastfeeding positively influences the newborn’s gut microbiota and health, reducing the risk of conditions like gastrointestinal infections and chronic diseases (e.g., allergies, asthma, diabetes, and obesity). Research has revealed that HBM contains beneficial microbes that aid gut microbiota maturation through mechanisms like antimicrobial production and pathogen exclusion. The HBM microbiota composition can be affected by several factors, including gestational age, delivery mode, medical treatments, lactation stage, as well as maternal lifestyle habits (e.g., diet, physical activity, sleep quality, smoking, alcohol consumption, stress level). Particularly, lifestyle factors can play a significant role in shaping the HBM microbiota by directly modulating the microbial composition or influencing the maternal gut microbiota and influencing the HBM microbes through the enteromammary pathway. This narrative review of current findings summarized how maternal lifestyle influences HBM microbiota. While the influence of maternal diet on HBM microbiota is well-documented, indicating that dietary patterns, especially those rich in plant-based proteins and complex carbohydrates, can positively influence HBM microbiota, the impact of other lifestyle factors is poorly investigated. Maintaining a healthy lifestyle during pregnancy and breastfeeding is crucial for the health of both mother and baby. Understanding how maternal lifestyle factors influence microbial colonization of HBM, along with their interactions and impact, is key to developing new strategies that support the beneficial maturation of the infant’s gut microbiota.

Low adherence to healthy lifestyle behaviors during pregnancy and lactation is strongly associated with a higher risk of childhood obesity. This narrative review aims to elucidate and summarize the pivotal role played by physical activity (PA) during pregnancy and breastfeeding, highlighting the potential mechanisms linking PA in these periods to the prevention of childhood obesity. Maternal exercise during pregnancy and breastfeeding significantly reduces the risk of childhood obesity by enhancing fetal metabolism, supporting healthy maternal weight management, and promoting improved breastfeeding practices. Pregnancy and the postpartum period represent critical windows for implementing preventive strategies that benefit both the mother and child. Encouraging an active lifestyle during pregnancy and breastfeeding is a vital public health strategy with extensive benefits. Healthcare professionals play a crucial role in creating supportive environments and providing tailored guidance to empower mothers to engage in regular PA. This approach not only enhances individual health outcomes but also contributes to the broader goal of fostering healthier communities.

Background/Objectives: Inadequate gestational weight gain (GWG), encompassing both low and excessive, is a significant concern because of its association with adverse maternal and neonatal health outcomes. The relationships between maternal lifestyle factors, such as diet, physical activity, prepregnancy body mass index (BMI), and GWG, are complex. This study aims to explore these associations via correspondence analysis (CA), a method that visualizes the relationships between categorical variables. Methods: A CA was conducted using baseline data from the ongoing LIMIT (Lifestyle and Microbiome Interaction Early Adiposity Rebound in Children) prospective cohort study. The analysis included 162 subjects whose complete maternal characteristic data were available to explore associations between maternal features and GWG. Results: The results were visualized through a two-dimensional graphical representation, with the related statistical measures. The horizontal axis of the CA map captures 63.4% of the total inertia of the data, and the vertical axis captures 36.6%. Maternal profiles with lower education, smoking, high meat consumption, and prepregnancy overweight or obesity showed a higher prevalence of excess GWG than did the average profile. Compared with the average profile, medium Mediterranean diet adherence was associated with a greater prevalence of low GWG and underweight and obese mothers with adequate GWG. Conclusions: This study identifies maternal lifestyle factors, such as diet and physical activity, as key determinants of GWG, with excess GWG linked to unhealthy behaviors. Tailored interventions focusing on prepregnancy BMI and dietary habits could optimize pregnancy outcomes. Personalized prenatal care is essential for managing GWG and improving maternal health.