The purpose of this prosective and retrospective observational study is to analyze the clinical and echocardiographic characteristics of infants with prenatal diagnosis of suspected aortic coarctation (CoAo) in order to identify clinical and instrumental elements that can predict the risk of developing aortic coarctation in the neonatal period so that we can identify patients who are at high risk and would therefore require intensive care and observation; compared with low-risk patients, for whom early discharge would be evaluable.