While 23 percent worried about the changes that had happened within their job role or company during their maternity leave.
Others had worries about the childcare juggling act and having to leave their child with someone else.
But even when they did get back to the workplace, it took the average mum more than six months to get used to the commute.
As many as four in 10 also felt they had to “prove” themselves to their colleagues and bosses, with 34 percent worried they were no longer good enough.
Despite this, 55 percent said their company made them feel welcome upon their return and 53 percent felt their change in priorities were acknowledged and accepted.
The findings come as Maltesers launches a new social media campaign, #TheMaternityReturn, looking at the importance of support when returning to the workplace after maternity leave.
Leah Dyckes, from Maltesers, said: “There is no single experience for women going back to work after becoming a new mum.
“While many women relish the return to work and welcome the variety it brings to new family life, it can also be overwhelming and a real struggle to make it work.
“For some, the result can even be worsening mental health.”
The study also found nearly four in 10 felt nervous before going back to work while a third were overwhelmed and self-conscious.
For 48 percent, the length of time it took them to settle back in came as a surprise as it was longer than expected.
Despite a quarter of mums feeling organised and a further quarter happy, the top emotions of working mums when returning to their day job were found to be tired (30 percent), overwhelmed (28 percent) and guilty (26 percent).
The study, conducted by OnePoll, also revealed 72 percent stayed in touch with office peers while on maternity leave, with 76 percent believing this helped them settle back in quicker.
Earning money (50 percent), being able to go to the toilet in peace (35 percent) and seeing colleagues again (34 percent) were the top things mums most looked forward to about going back to work.
Of those with more than one child, 71 percent felt it was more difficult going back the first time round because it was something they hadn’t experienced before.
And 51 percent admitted they waited longer than expected to have another child due to their previous experience of returning to their job.
Leah Dyckes added: “Our #TheMaternityReturn campaign will aim to give a platform to working mums to share the ups, the downs, the difficulties, and challenges of returning to work.
“This is alongside urging the colleagues, friends and family of mothers to do what they can do to support the mums in their lives as they return to work – all because we know that it’s one mother of a job.”
TOP 20 WORRIES MUMS’ HAVE WHEN RETURNING BACK TO WORK
- Leaving their baby/child with someone else
- Juggling childcare
- Having to take time off work when their baby/ child is ill
- Having to be more organised to get everything ready for work/ nursery/ school
- Dealing with changes that happened with the job/ company while they were on maternity leave
- Paying for childcare
- Fitting back into the job and knowing the role
- Fitting back into the team when their life had changed so much
- Forgetting what to do
- Feeling like they are still just as competent now as they were before the baby
- Change in finances when going part-time
- Not being up to date with the changes in the industry
- Colleagues not understanding the pressures of having a child
- Not being able to work late/come in early when everyone else does
- Nursery/childminder calling during work
- Dealing with the physical effects of having had a child when returning to the workplace e.g. potential incontinence, recovering from C-sections
- Having to navigate conversations around not being able to socialise as much
- That colleagues will see them in a different light
- Not wanting to socialise as much as everyone else
- Not understanding the in-jokes after having time away
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