HowardCoombs if both people were unrelated to the child I would choose the mother of three with experience. If option B refers to the mother of the child - then I would say irrespective of experience the great majority of mothers are in the better position to look after their little one (with support from family, helpers, educational resources) than an unrelated woman with tonnes of experience especially when the going gets tough! I guess in your opinion you would say that your helper was in a better position to care for your first born than your wife and you would choose the helper over your inexperienced wife to look after him or her - I mean, seriously, each to their own, but I find that a little strange.
Moreover, many helpers have had children but have little experience raising them as they are over here (sadly) raising our babies.
I have never suggested that a natural mother is the only one capable of looking after a baby -there are plenty of adoptive mothers, foster mother, grand parents who do a fine job, what I have said is that leaving a 6 month old with a helper you have know for 2 months for a week or two on her own is silly. It's unfair to the helper and baby. Even when my children were younger I could not go a whole week all alone without another soul to help. At times, I would almost leap onto my husband at the end of his work day because I'd had a bad day with bubs (because I was so relieved he was there to give me a break and this is AFTER ONE DAY), OP helper would not have this luxury and likely the baby would suffer as a consequence.
But to contemplate and consider leaving a child with a perfectly capable adult is not silly at all
True, we both agree on this point as do the majority of posters here. What the majority are comfortable with is leaving a young infant for a few hours, a day, day or two with a capable adult, but in your world, a week or two, or perhaps more with a "capable" stranger is completely au fait. But again, each to their own.