Entrepreneur Pamela Kennedy set up Adore Baby after deciding to move away from designing wedding dresses.
The creations of the Glasgow company were spotted by buyers at House of Fraser on the online shopping portal Not on the High Street.
Now Ms Kennedy is in the final stages of providing 300 gowns, likely to retail at between £100 and £110, which will be sold through House of Fraser's online shopping site.
She expects the collection to be available before Christmas and said: "Fraser's had been looking for a christening wear range for a while and hadn't found anything suitable. We have got lots made and are getting the order together for them.
"We are using a Scottish factory to get the majority of them made up, as we are a very small business."
If sales are successful Ms Kennedy is hopeful of further orders from House of Fraser.
The deal with the department store operator, which Sir Tom Hunter has a stake in, came as she was applying for funding to move from the converted basement in her home into dedicated business premises in Clarkston.
Her business plan also involved buying new equipment because the company was already seeing an increase in demand for its outfits after revamping its own website.
She said: "We are expanding at the moment and have been doing brilliantly.
"Our business has about doubled from last year with our own online sales.
"In a typical week we would probably do about 10 to 15 orders which would be a gown, bonnet and booties or some variation of that."
Royal Bank of Scotland provided a £20,000 loan allowing Adore Baby to move into a site in Clarkston, East Renfrewshire as well as adding new equipment and material to fulfil the House of Fraser contact.
Ms Kennedy, who trained as a designer and worked in bridalwear for more than a decade before setting up Adore Baby in 2006.
She said: "We bought new embroidery machines so we can offer personalisation and sewing machines, big cutting tables and new computers.
"The funding enabled us to take that step further."
RBS relationship manager Peter Allish said: "I am so pleased to have been in a position to have been able to support Pamela with her venture.
"The quality of her products is the root of her success and I look forward to seeing Adore Baby continue to grow in the coming years."
The business, which also employs a machinist and personal assistant, has longer term plans to expand its range into special occasion and party wear for babies.
However Ms Kennedy admits things are so busy with christening clothing at the moment the focus is on widening the offering in that area.
She added: "People are buying outfits for things like naming ceremonies or parties to welcome a baby.
"We are getting lots of orders for little dresses and rompers and things like that."