Little Brazil in New York City is little. It lies on 46th Street between Fifth and Sixth avenues, and there are on this particular block enough other languages/countries represented in the retail establishments that in the past, when walking along it, I had not actually noticed the Brazilian aspect of it.
There are, however, definitely Brazilian shopping and eating destinations here. In addition, this is the epicenter of Brazilian Day in New York, and I guarantee that if you visit Little Brazil on that day, it will not seem in the slightest bit little.