Prepare a separate space for the kitten with food, water, litter box, and toys. Allow the cat and kitten to smell each other's scent before meeting face to face.
Swap bedding between the cat and kitten to familiarize them with each other's scent. Feed them on opposite sides of a closed door to create positive associations.
Once they seem comfortable with each other's scent, allow supervised face-to-face interactions. Use positive reinforcement like treats to reward calm behavior.
Monitor their interactions closely and separate them if there are signs of aggression. Gradually increase their time together and provide plenty of vertical space for the cat to retreat.
Continue to supervise their interactions until they can coexist peacefully. Be patient as it may take time for them to adjust to each other's presence.
With time and patience, your cat and new kitten can become friends. Provide equal attention and love to both pets to ensure a harmonious relationship.