Welcoming the child and his or her guardians Invite them to participate, explain the study, and collect informed consent Recording of vaccinations in the medical record Safety check-list and identification Structural and environmental adaptation of the office Decorated nursing uniforms Use of distracting and rewarding elements according to age Preparation of vaccines out of sight of children Apply antalgic measures according to age and preferences. If the skin is dirty, clean it with physiological saline solution. Administer vaccines from least painful to most painful Only cover the puncture site if there is bleeding. Give post-vaccination recommendations Measure pain before, during and after vaccination with validated scales according to age

The "right 5+2" might be identified (patient, vaccine, interval, dose, route of administration, anatomical site, record) might be identified In infants, a non-pressing but secure breastfeeding position is recommended >3 years old: they sit on the tutor's lap, encouraging their collaboration to hold the child without compressing ensuring to avoid movements, and try to distract them 6-12 years old: they sit in the chair with the tutor sitting next to him/her and they are vaccinated asking for the child's collaboration. If necessary, they might be held to avoid movements Vaccines will be administered following The 2021 Vaccination Protocol Tutors will receive recommendations on adverse effects Queries might be solved The atmosphere of the immunization clinic is similar to the rest of the clinics in the health centre (white walls and no child decoration) The uniform used by the nurses is white and the vaccination techniques are the same as those previously used in these centres

Structural adaptation of the vaccination areas and cozy decoration (colorful room, mobiles to hang on the ceiling) Nursing uniforms decorated with children's pictures Introduction of toys, stuffed animals, stamps and reward stickers, drawings and crayons, soothing music in the background

Antalgic measures by age ranges:

0-6M (FLACC scale) Breastfeed for two minutes if infant is breastfeeding Glucose 33% or 50% or if rotavirus vaccination, on mother's pacifier or gloved finger (non-nutritive sucking) Comfort between vaccinations 6-15M (FLACC scale) Position infant sitting on guardian's lap facing forward Distraction techniques: stuffed animals, toys, audiovisual devices 3-6Y (Wong-Baker scale) Involve child, explain Child sits on tutor's lap facing forward Distraction techniques: audiovisual devices, drawings 6-14Y (VAS scale)Always seated. Distraction method: audio-visual devices, breathing

It is expected to reduce by 20% the perception of pain during the vaccination act in the IG with respect to the CG. Defining the success of the interventions with an applicable Moderate-High pain measure from 0-3 (FLACCr Scale value 3-5 and 6), Wong-Baker Scale applicable from 3-7 years (Mild= 2; Moderate= 4-6) and Visual Analog Scale applicable from 6 years (Mild 0-2).

We will proceed to distinguish the number of vaccines received by infants in the different visits/age group and the vaccines themselves, as some are more painful than others. The most painful vaccines: Triple Viral, Pneumococcal 13 and Human Papilloma Virus. The less painful vaccines: Hexavalent, Meningococcal C, and Tetravalent Meningococcal.

It is expected to reduce by 20% the perception of pain during the vaccination act in the IG with respect to the CG. Defining the success of the interventions with an applicable Moderate-High pain measure from 0-3 (FLACCr Scale value 3-5 and 6), Wong-Baker Scale applicable from 3-7 years (Mild= 2; Moderate= 4-6) and Visual Analog Scale applicable from 6 years (Mild 0-2).

We will proceed to distinguish the number of vaccines received by infants in the different visits/age group and the vaccines themselves, as some are more painful than others. The most painful vaccines: Triple Viral, Pneumococcal 13 and Human Papilloma Virus. The less painful vaccines: Hexavalent, Meningococcal C, and Tetravalent Meningococcal.