The truth of the matter is that none of us have any idea.
Because there were two flats below Mrs fenns and another at the side adjoining .... all with a young child or young children in.
Also there were three children sharing a bedroom in the Mccann flat. One start howling and they all would.
Frankly I do not believe that had Madeleine wakened up, she would have wandered into the lounge or into her parents bedroom and stayed there crying.
Madeleine is a pro-active go-getting kid; she wouldn't have hesitated, IMO, from waking her siblings up if she was lonely and cried for long.
also Mrs Fenns hearing is unlikely to have been good and could even be like 3 out of four of us .... such that she could not identify the direction the crying came from ... I usually have no idea where sound comes from these days.
All of four of us are in the same age group as Mrs Fenn was.
Totally unsafe, my dear Red, to say that the sound came from the Mccann flat
Totally unsafe to latch the crying and apparent length of crying to the Mccann family. We just don't know.