Where are you from? Haven't you been to the zoo? Take the subway and get off at Xizhimen, get off at any bus and go to Beijing Zoo. Opposite the zoo is the clothing wholesale market. A few dollars for summer clothes is cheap enough, and children's clothes are a little more expensive, but they are also quite cheap. Be sure to choose a good merchant, try to get clothes in batches, the price can be reduced, or let him introduce you if his family doesn't have it! I wish you a prosperous business!