Amazon does not have a clear limit on the number of items that can be shipped for new products, but it is recommended to make reasonable plans based on market demand and sales plans. Generally speaking, the shipping quantity can be determined based on sales expectations and market demand, while also taking inventory management and cash flow into consideration.

When determining the shipping quantity, you can refer to historical sales data, market trends, and competitor performance to ensure that market demand can be met without causing excessive inventory backlogs. The final shipping quantity should be a reasonable decision after comprehensive consideration.