An Italian film, monochromatic about a little boy who is playing on a terrace in a high building apartment. While playing he almost falls from the terrace and his mom holds him for hours until she saves him. Most of the film is on the terrace. The film is for 1950-1970 A famous actress.
La Madre di Torino (1967) directed by Gianni Bongioanni.
I could only find a few pictures from it, it doesn’t even have an IMDb page.
Someone from hinative.com has found it for you: