1. Use a thread with a color similar to that of the doll: Use a thread with a color similar to that of the cotton doll's hair, so it is not easy to be abrupt when sewing, and the thread head can be well hidden.

2. Use single strand: single strand is thinner than double strand. When using single-strand seam, the seam marks will not be so obvious.

3. Use the same thread as the doll: Use the same thread as the cotton doll, such as pure cotton thread and light silk, which can better blend into the cotton doll's material and reduce the visibility of the stitching.