A company which harvests stem cells from placentas has admitted an “error” in one of its blogs.

Cells4Life in West Sussex charges to collect the cells which it claims can provide an insurance should the child develop a disease later in life.

Cells4Life’s blog said immediate clamping was “under 60 seconds” but a health watchdog  recommends not clamping the umbilical cord before a minute.

The promotional blog has been amended.