Mist,
You have to define what you mean by "safe". Safe as in, the maid won't abuse the baby, or safe as in the maid will not do "naughty" things?
For me, my turning point in thinking, came after the agent told me this : She said her own youngest child, was brought up by maid.. and this child is the best-taken care of, EVEN though, her maid do nonsense thing, like have a boyfriend! She was trying to tell me that Phil maids are generally very loving and kind by nature and they like kids..
So then, I start to think rationally. Even if the maid has boyfriend, or do other "bad" things, as long as the maid is responsible for my child, takes good care of her, then it's not that bad. Of course, we all hope the maid will be guai-guai, but if really cannot, then at least I know the maid will not harm my child - and that is the most important. Well, of course, nothing is guaranteed la.. so it still boils down to luck.