In order to reduce the weight of baby walker, most of parts are made by plastic. On the other hand, plastic parts are stronger and colorful. Therefore, the quality of plastic parts of baby walker become very important. The key point of plastic injection mould for making baby walker is to get smooth surface and parting line to avoid injury against babies. Meanwhile, the assembly among of all plastic parts for baby walker is required flat without difference in level, prevent from collapse, enough strong and so on. It has to pay attention on the shrinkage of molds design and precise mold fabrication in order to get perfect assembly of baby walker, especially the small toy parts.