How does a Mother's Voice Affect her Newborn Baby?

This time, head physician Igor M. Ravnik, M.D., is hosting prof. dr. Manuela Filippa, researcher at the University of Aosta and the University of Geneva, a musician, educator and developmental psychologist whose extensive personal and professional experience led her to research the voice at the very beginning of life. She studies how the mother's voice affects the newborn baby – with a particular focus on premature babies. On the stability of its vital functions, the perception of pain, and the long-term effects of mental and emotional development.
Does only the mother's voice work? What about fathers? Speech as singing? Can a recording help the child in the mother's absence?