Inclusion Criteria:  Being a healthy baby born at term Being 4 months old Having no chronic disease, Having no neurological disease. Not taking an analgesic drug within 24 hours before vaccination.  Exclusion Criteria:  Being an unhealthy baby born at preterm or post-term, Being younger or older than 4 months old, Having a chronic disease, Having a neurological disease, Taking an analgesic drug within 24 hours before vaccination.