It's here: The Rise of the Onlies

11 Dec

Why this quiet demographic shift matters more than you think...

Something important is shifting in Australian family life, and it’s happening faster than most schools realise.

The rise of the only child is here - and it’s reshaping your future enrolments.

In Australia, the rate of single-child families has been climbing steadily for decades - now sitting at nearly double what it was in the 1980s. And yet, in school land, we talk far more about enrolment numbers than we do about the shape of the families behind them.

It’s time we paid attention.

So why are onlies on the rise?

Lots of reasons - and they’re not going away.

1. Older motherhood

Women are having children later, for reasons ranging from career to health to partnership timing. Demographically, older first-time motherhood correlates with smaller families. Simply put: start later, have fewer.

2. Financial realities

Raising a child is expensive. Raising multiple children can feel impossible. For some families, “one and done” is a strategic financial decision.

3. Environmental and lifestyle choices

Some families consciously choose one child because it aligns with their values or the lifestyle they want to create.

4. Fertility challenges

Let’s be honest and compassionate here: not every family gets to choose their family size. For some, health, finances, or the emotional toll of the journey mean one child is all that’s possible - and that reality is more common than most people realise.

Whatever the reason, the outcome is the same: Fewer siblings. More onlies.

Why this matters for independent schools

Let’s start with the obvious: Multiple siblings are gold for independent schools - especially primary schools.

Parents are stretched. Many need two incomes just to afford school fees. Juggling two different drop-offs is rare. Convenience, logistics, and cost all push siblings to stay together.

In secondary schools, it’s messier - I’ve lost count of how many families I’ve seen with three kids at three different high schools - but still, there’s a natural “stickiness” that helps us.

One family. Multiple enrolments. Predictable revenue.

Those days aren’t disappearing, but they are shrinking.

Why we’re about to work harder for every enrolment

When the number of only children increases, something simple but significant happens: You need more families to hit the same enrolment target.

No more relying on siblings to glide in behind big brother or big sister. Fewer “easy gets.” The goalposts are moving while we're playing the game.

This is a structural shift. And structural shifts demand strategic responses.

The upside for independent schools

Now we move from research to reality - the stuff we actually observe in our day-to-day. I genuinely believe the rise of only-child families can benefit independent schools.

Here’s why:

One child = more spending power. A family that couldn’t afford our fees for three kids might be able to stretch for one.
Some families intentionally stop at one because they want the private school experience. Education becomes the investment priority.
The pool widens. Families who would have been public-school parents if they had multiple children are suddenly in play for us.

Yes, we may have to work harder to bring in the same number of enrolments… but we also have a larger category of families who can now consider us.

What schools should do next

If you haven’t looked at this yet, now is the time.

1. Audit your data. Track your only-child numbers from Year 12 down to your incoming Prep/Kindy/Foundation cohort. Is the proportion rising? By how much?

2. Examine your lead pipeline. What percentage of your enquiries are for single-child families?

3. Watch the trend annually. Market shifts don’t announce themselves. They drift in quietly. Your leadership, marketing, and enrolments teams need to have eyes on this one.

So what’s the bigger picture?

Here it is - the line you may not have thought to look for:

When only-child families rise, your enrolment strategy must shift from relying on automatic sibling flow to intentionally capturing more first-time parents, more often, with more precision.

This is exactly why Diagnosis matters so much in marketing.

Anyone can run ads. Anyone can post on socials. But great school marketers know how to spot a trend before it hits them in the face.

Diagnosis is the discipline of:

reading the data
noticing patterns
asking better questions
and shaping strategy based on what the market is actually doing, not what we wish it were doing.

The "rise of the onlies" is a perfect example. It’s not a crisis. It’s a clue. A signal. An early tremor in the ground that tells you the landscape is shifting.

Schools that pick up on these signals and adjust their strategy accordingly will move first, adapt faster, and gain ground while everyone else is still wondering why their old playbook isn’t working anymore.

Because in school marketing: Those who diagnose well, win well.