What is meant by suppositions child –
Suppositious child 

Suppositious child means a factitious child.
Women may pretend pregnancy as well as delivery & later produces a child as if it is her own.
She may substitute a living male child for a dead child or for a living female child born of her.
Second born of a twin pregnancy
Child born out of wedlock
Child rear up by a woman & She claims the child
Heterozygous mother & father