Congrats on your pregnancy! From what I've heard around, Dr Manisha Mathur at KKH gets mentioned a lot, people say she's extremely good and very well-regarded, so she seems like a safe bet to look into. Dr Kwek Lee Koon is another name that comes up positively, and my neighbour actually saw her there and said she was really thorough and reassuring throughout the process. At 4 months, it's still a reasonable time to request a specific doctor, though you may have to be flexible depending on their availability under the subsidised scheme, worth calling KKH to check early so you can get slotted in before your next trimester appointments pile up.