Organizers said Tuesday that every child -- including newborns carried in their parents' arms -- must have their own tickets.

The rule has panicked pregnant women who bought tickets for themselves but not for their unborn children -- and touched off outrage on the powerful British parenting website, Mumsnet. Many infuriated mothers bought Olympic tickets before they became pregnant.

Some children's tickets are available for 1 pound ($1.55) but they are not sold for every event, making the problem difficult to rectify.

Tickets woes of all kinds have dogged the London Olympics, as demand for seats at Olympic events from July 27-Aug. 12 has far outstripped supply.