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The purpose of this study is to assess reliability and validity of Bayley Scales of Infant and Toddler Development–Third Edition (Bayley-III) in Malay version. This instrument is used to measure infant and toddler’s cognitive development, is comprise of five scales: mental, receptive communication, expressive communication, fine motor and gross motor. Bayley-III was translated into Malay language by using Back to Back Translation procedure proposed by Brislin (1973). Respondents of the present study were 34 infants between the age ranges of 9-13 months. This instrument consists of 17 age groups (AQ) and for this preliminary study, the group H and I were selected. After reliability assessment by using internal consistency method Alpha Cronbach, it was found that reliability for cognitive scale (r=. 923), receptive communication scale (r=. 765), expressive communication scale (r=. 796), fine motor (r=. 751), and gross motor (r=. 920). The results indicated that Bayley-III was high level of reliability in present study. As for convergence study of Bayley-III, it was established significant and positive inter correlation between five sub scales. Findings of the present study showed that Bayley-III can be used in Malaysian context specifically for children in Kota Kinabalu, Sabah, Malaysia.