J.C.
For my daughters, I have never had luck buying ahead. My daughters had really narrow feet although as they got older it became more average. I once found a sneaker that my daughter loved and it fit so I bought the next size up. For some weird reason when she outgrew the old sneaker I put her in the new sneaker that I thought was identical but it was too wide and just didn't fit right. Since great fitting shoes are so important I buy them when they need them.