HK Trip with Infant and a 5yr old child

Hi - I would be HK for a period of 2 months on work related assignmnet. My family i.e my wife and 2 kids (5yr old and 1 yr old) are planning to visit in the last 20 days. Hence, just wanted to check regarding below mentioned questions:

1. Would be fine to travel with a infant in the month of April?
2. Should we visit Macau for a day trip?
3. Plan to cover Disney Land, Ocean Park, Peak and Lantau Island as sightseeing.
4. For shopping, planning to visit Temple Street and Ladies Market

We dont want to make it very hectc with a small kid and hence the above sightseeing would be spread across 2 to 3 weekends. Let me know if there is anyother thing that can be covered in the evening where kids can enjoy.

Thanks!!.