Recent research by the Office for National Statistics shows that the UK's population is growing as more women have babies in their thirties. According to this recent report, the country is witnessing the fastest growth in population since the 1960s and this is partly due to rising fertility among all women.

Previously published figures show that two-thirds of this recent rise in population is due to migration in the UK. In October the ONS predicted that the population could reach 71 million, with migrants and their UK-born children accounting for 69% of that growth.

Total fertility in the UK has risen from 1.6 children per woman in 2001 to 1.8, the highest figure since 1980. There are now 1.7 births per UK-born woman 2.5 births per foreign-born woman.

Analysis indicates that women born both in the UK or overseas have contributed to rising fertility by having babies in their late twenties or thirties.

This indicates a demographic shift as women have chosen to delay having children until they are older for career reasons. This month on ThinkBaby we are asking you for your opinions on 'when is the right time to have a baby?' - cast your vote now in our online poll.