More and more of us are putting off having kids until we're established in our careers, so that it's easier for us to go back to work once we've settled into our new life.
Many of you might also wait longer because you haven't yet found Mr Right, or you may want to finish your studies or buy a house before thinking about kids.
All this means that mums of today are now, on average, a year older when they give birth than they were 10 years ago.
The figures also show that women having their very first child are more than a year older now than in 2000, up from 26.5 to 27.8.
Almost half of us are now 30 or older when we have a child. There's also been an increase in the number of mums older than 35, and fewer women now become pregnant when they're between 25 and 34.