Agree with MeiMei. The helper must be GOOD, which means she takes good care of the baby/child and probably also emotionally cares about the child quite a bit, such that the child gets also emotionally attached to the helper.. And babies that age really need somebody to turn to on a moment-to-moment basis (coz they have many needs). When mommy is working all day, obviously a relationship between helper and child inevitably establishes and even becomes very close.
In your case, it seems that the grandparents would have some amount of time to get involved. So why not work out a plan, e.g. helper only takes care of household and grandparents take care of the child; or helper gets involved only in "mechanical" help (changing diapers, bathing, feeding), but no cuddling and kissing with the child, no obvious show of affection..
Hope you can work it out, and don't be sad. It's most working moms' issue in HK. Also, it's good to know that your baby is in good hands while you're away rather than having a feeling that he won't be safe and happy during the day.
