No, kissing your baby does not change your breast milk.
Breast milk is produced by your body based on a complex interplay of hormones and signals. While your emotions can influence your overall health and well-being, they don't directly alter the composition of your breast milk.
Your baby's needs and your body's natural response to breastfeeding are the primary factors that determine the nutrients and antibodies present in your breast milk.
Enjoy the special bond of kissing your baby, knowing that it has no impact on the quality or composition of your breast milk.