It's just what mothers do, or should do. Biologically, it is essential.
Wearing our babies, kissing our babies, and nursing our babies is what nature intended.
When a mother kisses her baby, she ‘samples’ those pathogens that are on the baby’s face...Those are ones that the baby is about to ingest.These samples are taken up by the mother’s secondary lymphoid organs like the tonsils, and memory B cells specific for those pathogens are re-stimulated. These B cells then migrate to the mother’s breasts where they produce just those antibodies that the baby needs. -Lauren Sompayrac
And now you have one more reason to wear your baby, kiss your baby, and nurse your baby!