Hello, excuse me,which of the following fetus diseases are detectable by tests or ultrasound before delivery? (mbius syndrome,cranial nerve palsies, limb defects, orofacial clefts, arthrogryposis, talipes?

This would depend on the quality of the ultrasound, Some would be obvious like limb defects on a quality study. Some like Cranial nerve palsies/Mobius syndrome are not. A combined 4-5% of all pregnancies end in an unexpected outcome if you include prematurity, defects, infection, etc. Some of these do not emerge until delivery or soon after.

No clue