A third of millennials fail to make it through their three-month probation periods, a human resources expert has revealed.

Greg Weiss helps businesses integrate new workers but admits facing challenges with Generation Y.

He told Daily Mail Australia that millennials regularly under-perform, or are late or absent, and switch jobs often due to social media-induced envy.

Human resources expert Greg Weiss (pictured) has revealed why a third of Gen Y fail to make it through three-month probations. The author of So You Got the Job, WTF Is Next? said the problem of staff dropouts is 'exaggerated for Millennials'

Mr Weiss, founder and director of CareerSupport365, said Generation Y lose jobs because they score 'own goals' or make 'unforced errors', but companies are also not doing enough to keep them.

'The majority of reasons why probation fails is because of their [millennial's] own habits and lack of engagement,' he said.

'Of the reasons for failing, 62 per cent is poor performance, 50 per cent is absence, 25 per cent is lateness and 30 per cent is gross misconduct.'

Mr Weiss said millennials are 'the most connected, informed generation in history'.

'When Baby Boomers started work, there was little information around about an organisation and it was mostly the official line from that organisation,' he said.

He highlighted websites like Glassdoor, which make it easy to see reviews of prospective employers.

Mr Weiss said Generation Y lose jobs because they score 'own goals' or make 'unforced errors' but companies needed to invest more in training and building relationships to keep them (stock image)

'The ubiquitousness of social media has also meant that it's easier than ever to see and learn what other opportunities are out there,' he said.

But Mr Weiss said there’s a misconception that millennials are lazy and employers are partly to blame for high turnover by not offering proper training or managing expectations.

MAIN REASONS FOR NEW EMPLOYEE FAILURE 39%: Their specific role is not what they had anticipated during the hiring process 12%: Working for the company is not as presented during the hiring process 15%: They don’t see a path for advancement 15%: They don’t like their boss 19%: They don’t like the company culture Source: Mr Greg Weiss Advertisement

It is not only millennials who struggled to make it through probation as up to 25 per cent of employees overall struggle to make it through.

'It's known that the first three months is the time when the new employee is under an intense spotlight,' he said.

'Over half of onboarding programs lasted one week or less... certainly not enough time to successfully embed a new employee into their organisation.

'Unless the relationship is invested in the right ways from the very start, then turnover is more likely.'

Fourty-seven per cent of companies do not have a mentoring program, yet 98% acknowledge that a mentoring relationship would significantly help new employees.

Nearly all (90 per cent) of executives said that retention of new hires was an issue in their organisation, according to a Korn Ferry survey in 2017.

Generation Y will make up 75 per cent of the global workforce by 2025, according to Deloitte.

PwC estimated staff dropouts costed Australian businesses $3.8 billion in lost productivity and $385 million in avoidable recruitment costs in 2015.