The Godfather: Part II (1974)

Other mistake: When young Vito Corleone shoots Fanucci in the chest at the doorway to his apartment, in a continuous shot, a wound/blood bursts from Fanucci's white vest. When Fanucci proceeds to tear his vest open seemingly in disbelief he has been shot, there is no entry-wound, blood or hole in his white shirt directly under where the wound appeared in his vest.

Trivia: At Michael's hearing, very few of the senators, judges, etc. are actually actors. They are friends, acquaintances, and family of various members of the cast and crew.

Question: In the flashback of Vito Corleone's return to Corleone, Sicily with his young family, his wife is shown holding a baby in a bonnet in several scenes. On the train he is talking to an older child and calling him Michael. Who is the baby?