Objective: The purpose of the present study is to define the effects of baby massage on mentalmotor development of healthy full term babies. Design: The research was designed as experimental. Setting: Istanbul University Istanbul Medical Faculty Gynecology and Obstetry Clinic. Subjects: The group of the research includes totally 104 healthy and full term babies (of which 52 is in control and 52 is in experimental group) who born in Istanbul University Istanbul Medical Faculty Gynecology and Obstetry Clinic between June 2001 and October 2002, and taking pediatric polyclinic service for healthy children in same hospital and their mothers who comply with criterions of case select. Mothers, who were educated on performing baby massage following birth, were asked to apply the massage 15 minutes once a day for during six months. Mental-motor developments of the babies in the experiment and control groups were evaluated in the third and sixth months after birth using Ankara Developmental Screening Inventory (ADSI). Percentage, average, standard deviation, student's t and chi-square tests were used in statistical evaluations. Main outcome measures: Demographics of healthy full term baby including; weight, length and cranial circumference at birth, sex, birth modality, apgar score, solely breastfeeding duration and mental-motor development scores. Results: Experimental and control groups were similar each other in terms of sex, birth modalities, apgar scores, weight, height, and cranial circumference at birth, solely breastfeeding durations. (p>0.05). When mental-motor development of two groups were compared with ADSI It seen that lingual-cognitive, fine motor, gross motor, social skill-self-care subscale and overall development of the experiment group were significantly higher than the control group (p<0.05). Conclusions: It was concluded that mentalmotor development can be improved with baby massage in healthy full term babies.