Saan was born with transposition of the great arteries, to a Yazidi family living in a refugee camp in northern Iraq after fleeing from the invasion of the Islamic State eight years ago.
Monday night he and his mother flew into Israel, and today he had his first echo at Hadassah hospital in Jerusalem. His heart appears more complicated than expected, and at 3 kg (6.6 lbs) he is also too wasted to undergo a major surgery.
Doctors will seek now to increase his weight and study his anatomy in preparation for surgery.