Occasionally a pregnant woman will describe a distinctive 'click' or 'pop' coming from inside her uterus, usually when her baby is moving during middle to late pregnancy. This is not very common, but we have been asked this question by a few women over the years during the course of them sharing their experiences.
The 'clicking' phenomenon is not documented in midwifery or obstetric text books. Therefore it is hard to know what really causes it. One plausible explanation may be that the baby's joints are rubbing or 'clicking' as they move, but we cannot be certain. In our experience, women who have noticed 'clicking' have gone on to have healthy, normal babies. Therefore we do not think it is anything to be concerned about. Perhaps it will just remain one of those strange mysteries of pregnancy?