Available sizes: 4.5 toddler,6 toddler,7 toddler,8.5 toddler,5.5 toddler. New Balance Shoes (Trainers) 323. Available in girl's sizes. By New Balance. With these 323 shoes, there's no need to worry about fashion faux pas. A timeless look that New Balance is proud of. As a brand that has a lot on its plate when it comes to trainers, it is taking advantage of this opportunity to bring together all the elements that have made it such a success. Do you dare try out this pair of trainers that defy the odds? So, what do you think? Flared midsole. Synthetic, suede and nylon upper featuring an exaggerated fang design inspired by the 320, 355 and Supercomp. Oversized NB branding.