I am 22W 6 days pregnant. At my 22 week ultrasound (Anomaly scan) doctor said no stomach bubble was visible, and the baby is confirmed a boy. but everything else looks perfect (kidneys, heart, bladder, etc). Doctor said there is another scan (Growth scan) if it is visible no problem. if not possibility of TOF need to be excluded after baby birth. What is the TOF? is it a major case? is it a major operation? what is the reason stomach bubble not visible? because my previous baby was perfect? Thanks for your kind advise.