If you're looking for a city in the US to shop wholesale, try Atlanta. While the selection isn't nearly that of New York, the cost of accommodation and getting around is vastly cheaper, and the Americas Mart is a serious wholesale venue that runs year-round.
If you're looking specifically for kids' stuff, the ABC Show in Las Vegas is probably the key event for you to attend -- the next one is in October.
Also, if you're looking to export specific brands, it might be helpful to contact those brands directly to see if they have representation/distribution in your country.
Frank