Given that the echocardiography device may apply slight pressure and mild sedation might be necessary in some cases, certain preliminary preparations are important. Infants aged 0-5 months should cease consuming milk or solid food at least 3 hours before the procedure, and infants aged 6-36 months should do so at least 6 hours prior. Furthermore, considering that mild sedation may be administered to children aged 4 years and under, it is crucial that they do not arrive on a full stomach before the procedure. For precise preparation instructions, please consult your pediatric cardiology specialist.