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Objectives: to describe the monthly trend of breastfeeding during hospitalization and the presence of companion of woman's choice during labour and birth, and the key regional responders' perspective of homogeneity/heterogeneity of the presence of the support person, before, during (February-May 2020), and after the first COVID-19 pandemic wave in a few Italian Regions., Design: two-phase study., Setting and Participants: data from the italian birth certificate of six Italian Regions between 01.01.2019 and 31.03.2021 were analysed. Semi-structured interviews were conducted with the key regional respondents., Main Outcome Measures: the frequency distributions of breastfeeding and the presence of companion of woman's choice were calculated as a whole and for each Region., Results: the infant feeding practices experienced smaller changes during COVID-19 pandemic than the presence of the companion of woman's choice during labour and birth, from January 2019 to March 2021. The highest value of exclusive breastfeeding was recorded in September 2020 (72.1%; 95%CI 71.3-72.8) in all Regions, while the lowest was recorded in March 2021 (62.5%; 95%CI 61.5-63.4). The presence of companion of woman's choice during labour and birth decreased during the pandemic and did not return to pre-pandemic levels. The highest value of presence of father during birth was recorded in March 2019 (59.0%; 95%CI 58.2-59.8), while the lowest in April 2020 (50.0%; 95%CI 49.1-50.8). The main emerging themes were: the existence of national, regional and local indications; the facilitators (e.g., Baby-Friendly Hospital Initiative implementation, strong motivation of the staff) and the critical points (e.g., inadequate analysis of the clinical-epidemiological context, inhomogeneous indications) of management of the support person presence., Conclusions: the emergency has changed the provision of health services that not always guaranteed the application of best practices. It would be desirable to work for assessing the appropriateness of the birth certificate data to collect more accurate information and to provide clinical recommendations.

During a pandemic, pregnancy and the postnatal period are complicated by multiple factors. On the one hand, worries about one's own health and the health of loved ones, in particular of the newborn child, can increase the risk of some mental disorders, such as depression and anxiety in the pregnant woman. On the other hand, as happened for the COVID-19 epidemic in Italy, given the need for physical distancing, the maintenance of the social and family network, so important for new parents in the perinatal period, is lacking. In addition, health services are forced to reorganize their offerings to ensure maximum safety for their operators and patients. This work proposes a model of screening and treatment aimed at identifying women at risk and providing them with effective and safe treatment.

Twins are a valuable resource for the study of complex traits. The twin method is substantially based on the comparison between correlations and concordance in monozygotic (MZ) and dizygotic (DZ) twins and allows several applications in biomedical and molecular genetic research. It allows either the qualitative and quantitative evaluation of the influences that genetic and environmental factors exert on phenotypes or the estimation of trait variability. Moreover, classical genetic linkage analysis is more powerful if performed in DZ twins. However, the twin method has some pitfalls, such as the necessity that collected samples be representative of both twin and general population. For this reason, over the last few years, a number of Countries have established population-based twin registers, which guarantee the maximum level of representation and, consequently, are of extreme value for epidemiological studies. Italy is also implementing a national twin register. The following is the description of the procedure that led to the establishment of the Italian Twin Registry.