Misdee, great idea - needs a business plan so you can see if it's viable.
You need to consider
Start-up costs (ie will you have to pay a premium to acquire a lease on the premises you need, how much will it cost to kit it out, buy initial stock, marketing, printing, buying/setting up the company etc) Do you have the capital/can you raise it?
Some kind of SWOT analysis (strengths, weaknesses, opportunities and threats) -
eg Strengths - you have prior knowledge of the market and have done research due to having kids of your own
Weaknesses - we have little capital and are very vulnerable to fluctuations in levels of business activity. We are vulnerable to suffer if one partner is sick as have small number of staff.
Opportunities - No competition, new type of business for the area, filling a gap in the market.
Threats - What if Mothercare decided to re-open outside the shopping centre? Would this wipe out your business?
Finacial Data -
Costs - ie Overheads/Capital equipment (rent, rates, utilities, staffing costs, taxes, stationery, computers, maintenance etc)
Costs of sale - ie Cost of buying in your stock (this includes stuff for the cafe of course)
Projected sales - Will the profit made from these be enough to cover the overheads and ongoing stock purchase, plus leave enough to pay yourselves (presumably you would staff it yourselves)
There is so much to think about! Suggest if you do an initial analysis along the lines of what I have put above and then approach a small business advisor at a bank you should be able to see if it's viable fairly quickly.