Heather -- the difference is that Gerber has strong brand recognition. For the shop in question, they are trying to develop *their* brand -- and don't want to compete with the OP's.
A better example is, say, Starbucks. They make their own coffee, but they may also sell baked goods that they don't make themselves. They don't tell you who makes them because they want to promote their brand, not the baker's. When you want a piece of lemon pound cake, they want you to come in and buy it along with your coffee.