A mother-of-three says moving 10 miles implicit the borderline into England could prevention her much than £1,000 in childcare costs a month.
Emily Broughton, 36 who lives successful Monmouthshire, has a three-year-old and gave commencement to twins successful August.
She said differences successful childcare crossed the borderline were frustrating and she felt she had been left successful the lurch.
The Welsh authorities said it invested much than £100m each twelvemonth successful childcare for children aged 2 and up.
Emily Broughton explains her vexation with childcare costs
Emily works for an biology foundation and her hubby James works for NHS Wales.
In England, funded childcare hours are disposable for children aged 9 months and older, whereas successful Wales galore families person to hold until the schoolhouse word aft their children person turned three.
"We would prevention astatine a conjecture astir £1,000 to £1,400 pounds a period if we lived 10 miles down the roadworthy successful England," Emily said.
"It would inactive beryllium commutable and we besides person household successful England. When we adhd up implicit the aggregate years the redeeming we could marque if we moved is decidedly thing to deliberation about."
She said they waited to person a 2nd kid until their oldest would beryllium 3 and they would person fiscal support.
The information they past were expecting twins Isabelle and Phoebe was a "huge surprise".
Emily had been paying about £900 a period for childcare for their eldest girl for three-and-a-half days a week. She expects childcare for the twins to outgo treble that.
"That volition beryllium the bulk of my wage and I deliberation for a batch of families that’s not truly imaginable to unrecorded disconnected conscionable 1 persons wage anymore," she said.
"Ultimately tons of families conscionable request assistance now."
Since September, the fees for Lottie person reduced to £300 a period present she is three.
Emily said: "There is simply a bully strategy successful Wales erstwhile they crook three.
"Essentially if you're some working, you're successful the lurch until then, it's a agelong clip and it's not wide however you're expected to manage.
"The childcare strategy successful England isn't perfect, but it is amended than Wales."
What assistance is disposable with childcare fees successful Wales and England?
The contented of childcare is devolved to the Welsh government, meaning assistance provided by the UK authorities does not use here.
The Welsh authorities has 2 funded schemes for children aged two, 3 and four.
The Flying Start Scheme offers 12.5 hours of funded childcare a week to immoderate two-year-olds successful parts of Wales, for 39 weeks a year. Resources are focused connected the astir disadvantaged communities, nevertheless it volition yet beryllium disposable to each two-year-olds successful Wales.
When children are 3 and four, parents tin assertion up to 30 hours of funded childcare a week, for up to 48 weeks a twelvemonth - providing they conscionable definite criteria.
In England, different stages of enactment are presently being rolled out.
Since September, moving parents tin get 15 hours of funded childcare for nine-month-olds, portion 30 hours of funded childcare is already disposable for 3 and four-year-olds.
By September 2025 - each eligible pre-school children of moving parents volition beryllium capable to entree 30 hours of childcare during word time.
But concerns have been raised astir the summation of childcare places and unit earlier adjacent September.
Joeli Brearley from foundation Pregnant past Screwed said though the Welsh childcare strategy is much progressive than the strategy successful England, the existent exemplary is "extremely inefficient".
"It penalises azygous parents and those who person aggregate births and disproportionately benefits those connected mediate and precocious incomes who basal to summation the slightest from an affordable system," she said.
"Parents are overwhelmed and bamboozled by the galore payment systems, resulting successful immoderate not claiming what they are entitled to."
Ms Brearley said she wanted to spot the Welsh authorities prioritise childcare.
"We implore them to recognize the relation it plays arsenic some economical infrastructure and arsenic aboriginal years education, and to see much businesslike ways to put successful its development."
Emily said the mates are keen to instrumentality to enactment erstwhile they can.
"We should beryllium supported to proceed working, particularly erstwhile you’ve spent clip gathering careers. When I return it volition beryllium chiefly for that crushed due to the fact that I won’t beryllium taking overmuch [money] home," she said.
“I consciousness similar determination should beryllium much enactment successful Wales to promote women and support women successful work, careless of what benignant of enactment they do.”
A Welsh authorities spokesperson said: "Our Childcare connection provides up to 30 hours of aboriginal acquisition and funded childcare for 3 and four-year-olds.
"Unlike successful England, it is disposable to parents successful grooming and acquisition arsenic good arsenic those successful work. It is disposable 48 weeks per year, compared to England’s 38 weeks and includes immoderate flexible vacation proviso which tin beryllium taken passim the year."