Racing out of stores are double buggies, because of the recent boom in the amount of twins that have been born through IVF treatment.
Sales have gone up 90% in some retail shops in Britain after a 10% rise in twin births over three years.
At the same time, the number of women having fertility treatment went up by a third.
In Sydney, the sales have also gone up a substantial amount. Although it has to be said that the figures are still nowhere near the relative percentages of Britain.
Twins are also more likely to happen to women who conceive later in life.