Oh, I looked into this area too when I was pregnant and staying near Pasir Ris! Dr Clifford Chan (full name Chan Chi Tung Clifford) is actually an obstetrician with about 33 years of experience, so he's definitely not a new doctor. His clinic at Loyang Point does seem to run limited hours, I heard it's roughly morning until around 3pm, then reopens in the evening, so that's probably why it feels like it's closed a lot when you walk past. Honestly, the limited hours could be a trade-off: more experienced doctor but you'd need to plan your visits carefully around the schedule. Might be worth calling ahead to confirm the hours and see if his availability works for your pregnancy journey.