I'm trying to decide what size spibelt to get for Charlotte. Her waist measured 22 1/2 inches. She's 4 1/2 and about 44 pounds. The kids' belt says it fits 14 to 23 inches. I can't imagine she needs an adult size, but I also hate for this kid size to be too small. For those of you that have spibelts, do you think she'll be okay with the kids' size?