You see it is not about previous experience, VO should be able to feel that person will be to carry out these duties. If you see in Canada they give some lessons to expecting mothers before handing over baby to them.. they don't want mothers to have previous child care experience. All they do is give some education on child care and some practical sessions. Child care is not rocket science but applicant shouldn't be naive. Any education regarding caregiver or practical experience should be sufficient.
There is a difference between mother taking care of a child and having a professional taking care of a child. Even-though the experience part is not mentioned in the guidelines they have mentioned to submit pay stubs, reference letters or contracts which is only possible if one will have a work experience.
Giving few lessons to mother doesn't make the mother a qualified child care specialist but still they will hand over the child because its child mother, who can take care of a child better than his/her mother and secondly its not mandatory for a mother to take classes. its optional.
Coming back to the professional part, there are many federal and provincial program where the guidelines are not clear about the work experience but that does not mean that the experience is not necessary.
Lets take an example of real case here - one of my client got an interview and the first question that was asked was how much experience she has? She answered and complete the rest of the interview and got the visa few days later. Now just think for a moment and imagine yourself at that point and VO asking you the same question as how much experience you have and you replying with the answer that "mothers dont need work experience to take care of their child so then why we need it? or your guidelines does not mention about work experience and so why are you asking?
what do you think will be an outcome here?
I am talking from my experience I have read many GCMS notes for the people who got refused and majority were that VO was not convinced that applicant will be able to perform jobs.
Cheers,