Hi Mandy,
I went for my detail scan at 20 weeks at TMC, so happened to see the pamplet for 3d/4d scans. So after the scan, when I saw the doctor, I asked him when would be a good time to see the baby for 4D scans. I think he said something about during 8 month, the baby is quite developed, so by that time it will be more meaningful to take the 4D scan. After all, its not cheap. But I know of mtbs who have done its earlier or quite regularly as well.
I am with Doc LC Cheng, hes on the first level, near the lift lobby, where the pharmacy is.
Strangely, so far he has not done weight measurements nor length measurements for me, since I pass the first trimester le. Hmmm, all your doctors does that? HOw nice.