If you see a waif in a dream that you are taking care of, then it denotes to the prosperity. On the other hand the waifs are the symbol of losses and poverty.
Dream dictionary: Waif dream meanings
Dreaming of a waif, denotes personal difficulties, and especial ill-luck in business.
(See Orphan)
…(Foundling | Waif) Picking-up an abandoned infant in a dream means picking-up one’s enemy, in conjunction to the story of Moses and Pharaoh. Picking up an abandoned child in a dream also could mean returning things to the way they should be, or dispelling distress and sorrow. If one sees himself planting an apple tree in a dream, it means adopting an orphan, or caring for one. To find oneself as an orphan in a dream means depression which is caused by injustice. To be an orphan in a dream also means feeling depressed because of one’s love for a woman, loss of property or money….