思樂冰,
If you are working in Quarry Bay, why not you move to QBY so that you can save up the transportation expenses and time.
The suite in QBY is around HKD3000+/-
You may find a helper (搵人湊) who can take care of your baby for
1) either pick up after you are off (may be cheaper)
2) overnight and pick up every weekend (more expensive)
3) You may write a notice and post at Park n' Shop or Welcome to find a helper.