KKH doesnt do scanning after 4th month?

Definitely not true. I think all hospitals even the subsidized ones are supposed to provide ultrasound scans readily available as they have the facilities. You can enquire on this with their staffs if you're unsure but if you're going for subsidized hospitals, I'd highly recommend SGH or NUH. KKH has a known reputation for shitty customer service lol but it depends. Entirely up to you :)