A parent of 2 said she lone makes £2 a time erstwhile she works overtime owed to the rising outgo of childcare fees.
Louise Morgan, from Swansea, wants to enactment much hours to beforehand her career, but said it was not worthy the fiscal cost.
The 33-year-old said she felt near down and would get overlooked arsenic "I'm lone determination 3 days a week".
The Welsh authorities said each workers should person an automatic close to petition flexible working.
Ms Morgan lives with her spouse Josh Doyle and their sons Dexter, three, and two-year-old Teddy.
She is simply a part-time admin serviceman and wants to enactment afloat clip to marque much wealth and advancement successful her career, but adjacent with authorities help, it is not worthy it.
Childcare for Dexter and Teddy is £71 a time and Ms Morgan makes £73 erstwhile she works overtime.
She said Josh worked six days a week, sometimes seven, and wants to enactment much shifts, particularly with Christmas coming up arsenic she wants "to spoil" her sons.
The Welsh authorities provides 30 hours of escaped childcare a week for moving parents of 3 and four-year-olds.
While Ms Morgan said the creche her children attends is "amazing", her friends respond with fearfulness erstwhile they perceive the cost.
"They're like... 'You tin spell connected vacation each period for that'," she told BBC Wales Live.
Nikola Masters owns Osbourne Lodge Day Nursery successful Pontypool, Torfaen.
She said the 10% emergence successful minimum wage, coupled with expanding nutrient bills and a "three-fold increase" successful state and energy costs meant her outgoings would beryllium £40,000 much adjacent year.
Ms Masters said she "had to walk that on" successful the signifier of accrued fees.
"If we can't summation our fees, we can't tally and parents can't get to work. The mean outgoings for a time nursery is 75-80% connected unit wages.
"Parents mostly spot the idiosyncratic they manus the kid implicit to, they don't spot the bigger outgo of what goes connected down the scenes, and the immense magnitude of admin that we request to implicit connected a regular basis."
The Welsh authorities said it had already announced an other £6m per twelvemonth to wage childcare providers £5 per hour, up from £4.50, from April.
The maximum magnitude nurseries tin complaint for nutrient has besides accrued from £7.50 a time to £9.
Ms Masters said nurseries were not conscionable childminders, but places wherever children tin learn.
"A kid tin larn fantastic things astatine home, but what they larn is their family's knowledge. When you bring a kid into a assemblage with different children, antithetic adults, antithetic carers, that kid is opened up to a full caller satellite of development."
Jonathan Broadberry, caput of argumentation astatine the National Day Nursery Association, said nurseries faced a raft of rising costs.
"You can't crook the heating disconnected successful the nursery. You can't not provender the children truthful these are costs wherever you can't marque savings."
Mr Broadberry said either parents would beryllium paying much oregon authorities rates had to support gait with the summation successful costs.
Claire Protheroe, the nationalist manager of Professional Association for Childcare and Early Years Cymru, said childcare providers faced "a crisis".
"Mortgage and rent increases are impacting connected galore and really forcing the closure of some.
"We've seen a diminution successful childminder numbers successful Wales successful the past twelvemonth by astir 14% alone. It's drastic."
Sarah Rees, caput of Oxfam Cymru, said affordable childcare was the "basis of enactment that we request to alteration radical to spell to work".
She added: "You tin gain much wealth moving successful supermarkets alternatively than taking attraction of the astir precious radical successful our lives."