Fasting for 4 hours

• Longitudinal pylorus without and with canal length measurement (normal less than 15 mm)
• Transverse (short axis) pylorus without and with single wall muscle thickness measurement (normal less than 3 mm)
• Transverse pylorus with double wall measurement (normal less than 10 mm)
• Position baby inclined, left side elevated position during/after feeding.  Watch for food material to transit through pyloric channel.  Image this (still and/or cine clip)