I can't see how this is important. Madeleine was alive and well at 20.30 according to her parents. How then could she be under a pile of laundry in a stairwell ?
Unless you don't believe the parents account.
Jane Tanner's original estimate was the child to be 2 years old. There is nothing about Jane Tanner's original account to suggest the man was carrying Madeleine. I'm not suggesting the child being carried was Madeleine.
All we are looking at is the potential of an accident happening, most likely over at block 4, when bundles of laundry were thrown down the hole in the stairwell.
"Meanwhile a man appeared ( * ) carrying a child (**), with a hurried walk, it being this detail together with the fact that the child dressed in pyjamas, without being wrapped up in a blanket, that caught her attention. She only managed to see him from the side, with the child in his arms. She noticed the individual's presence exactly when she had just passed by Gerry and Jez who were talking, having seen this person step off the pavement that borders on the apartment block where they were staying and rapidly cross the road."
"Personal description:
( * ) Dark skinned individual, male sex, aged between 35-40, slim physical appearance, about 1.70m tall. Very dark, thick hair, longer at the back (she could only see him from behind). He was wearing linen type cloth trousers, beige to golden in colour, a "duffy" sic type jacket (but not that thick). His shoes were dark in colour, classic type. He had a hurried walk. He was carrying a child, who was lying on both his arms, in front of his chest. By the way he was dressed, he gave her the impression that he was not a tourist, because he was very "warmly dressed".
(**) About the child whom appeared to be sleeping, she only saw her legs.
The child appeared to be older than a baby. She was barefoot and was wearing what appeared to be cotton pyjamas of a light colour (possibly white or light pink). She is not certain, but has the impression a design on the pyjamas, possibly a floral pattern, but she is not certain."