Stride Rite baby shoes

My babe is currently 9 months old and on the verge of taking her first steps! We are going to Disney World next month (she'll be 10 months and 5 days when we get there) and I'm wanting to get her a pair of shoes/sandals because she loves to stand and who knows, could be walking by then. Her entire life so far she's spent exactly 1 hour ever wearing shoes so I'm not sure where to start. My mom keeps talking about Stride Rite shoes, but the only selection I can find near me is very limited so I'm shopping online. Does anyone have tips for baby shoe shopping online? I'm following their measuring guide and it seems like size 4 wide is going to be the way to go. If I get them soon is there a big risk that she could grow out of them by next month? I want to have enough time for her to get used to them and allot for shipping time if I order and for some reason have to send them back. I'm primarily looking for styles that won't require socks, like these: