article_snippet: Scroll down for video .
article_snippet: As part of the study, Dr Nadja Reissland, of Durham University, used 4-D ultrasound scan images to record thousands of tiny movements in the womb.
article_snippet: All the babies in Dr Reissland study were born healthy, and were of normal size and weight.
article_snippet: The research was published in the journal Acta Paediatrica.