1. Prepare tools and materials: You may need a pair of scissors, sewing needle and thread, fillers (such as cotton) and appropriate adhesives (if necessary).
2. Measurement and adjustment: First, measure the diameter of the doll's neck and compare it with the lower diameter of the doll's head. If the diameter of the lower part of the doll's head is larger than the diameter of the doll's neck, you may need to reduce the lower part of the doll's head.
3. Reduce the lower part of the doll's head: carefully cut off the excess material under the doll's head with scissors to make it adapt to the size of the neck. Be sure to cut it flat to avoid damaging the appearance of the doll head.
4. Sewing or bonding: Put the doll's head on the neck and align the lower part with the neck. Sew the doll's head and neck together with needle and thread. Or, if you can, you can fix the doll head around your neck with suitable adhesive. Ensure that the sewing or bonding is firm, so as to ensure that the doll head will not loosen or fall off.
5. Filling and shaping: Put the filler (such as cotton) in the gap between the doll's head and neck to make it look more natural. Adjust the amount of filler as needed to achieve the desired effect.