Hi mommy, both of those procedures have different purposes kasi and can’t be compared to one another. Yung CAS is more on the medical aspect to thoroughly check your baby if s/he is healthy and has no abnormalities. On the other hand yung 4D naman is mainly on the aesthetic side, like kung gusto mo lang makita itchura ni baby while inside your womb. 😊
CAS, makikita kasi kung fully developed na si baby nun kung normal ba or may diperensya
Thanks mamsh
sky