Bigger Prefolds?

[Teresa]

Right now, my 12-month old dd wears regular Thirsties prefolds (14.5 x 21). Lately, I've had a little harder time snappying them without them being too tight. It's like she needs a wider prefold. 2 questions:

1. Should I buy new prefolds? DD has only been walking for about 3 weeks, and I wonder if she might slim down where the prefolds again fit better.

2. If I should buy more, where in the world do I find them? All the ones I've seen that are premium or toddler don't seem to be wider than what I'm already using.

Thanks mommas!