Direct2Mum has seen turnover rise from £3m to £6m in the last year and is now planning to open three new stores as a result.
The firm started as an online shop in 2010 operating out of 13,000 sq ft premises at Dodworth Business Park.
It opened its first walk-in store in 100,000 sq ft new premises nearby in May 2014 and is now expecting turnover to hit £10m next year.
Managing director Alex Leslie said: “This is an exciting time for us as a company as we’ve seen exponential growth this year, but we’re always looking at how we can grow and expand further.
“It’s great to see that our turnover has doubled, and we’re really keen to see the business grow further and become a household name.
“We pride ourselves on being there for parents from day one and we understand what we need to do to help parents make the right decisions for their child, and choose the right products for them.”
Around 60% of Direct2Mum sales are still online with products being sent all over the UK and its Barnsley store is now attracting customers from as far afield as London and Hull.
Direct2Mum stocks over 8,000 different items, ranging from prams, car seats, baby bags, feeding equipment and bath products.
It employs 53 staff, including those who are specially trained to offer expert advice to parents, as well as being able to set up any equipment bought in store, such as installing a car seat.
The company is looking at London, Manchester and Birmingham as potential cities for expansion as it grows its UK presence.
The expansion is being backed by Barnsley Business and Innovation Centre (BBIC), through Enterprising Barnsley.