Yue sao typically are live-in domestic helpers who care for both the new mother and baby for the first month after birth. Salaries as at 2017 vary from RMB8000 to RMB20000 per month depending on city and experience.[21] They are described as "mothering the mother"[22]. Australian documentary-maker Aela Callan called them "Chinese supermums" but says they are colloquially known as "confinement ladies".[23]