I'm sorry, maybe you can email support or ask Gazza to fix your store back to how you want it. I see not reason to get rid of "baby stuff". Was that a specific category?
Maybe it's a more American term? We use "infant" for baby clothes 24 months and under. Over 24 months we have size 2T, 3T, 4T (for toddlers, and it is a size, not age), then it goes to 4, 5, 6, 6X, etc. (I think the toddler clothing may be bigger in the diaper area).