There is a trio of behaviors in the first 1000 days of life & the relation of this trio in the formation of deciduous teeth. Technically, the first behavioral component is Early Initiation of Breast Feeding (EIBF) followed by Exclusive Breast Feeding (EBF) & the next is the Infant & Young Child Feeding (IYCF). One can surely ponder what role does the Colostrum rich milk has which only flows for the first five days of life has in the formation of deciduous teeth. The next question is to elicit the role of Mature Breast Milk (MBM) in the development of deciduous teeth. Finally, the question arises about the role of Complementary Feeding (CF) or IYCF has in the development of the deciduous teeth. This article focuses on the burden of the issue of deciduous teeth development through the above- mentioned indicators. Thereafter through literature reviews, it delineates the role of these trio behaviors. The article also delves into the literature regarding the deciduous teeth before entering the domain of the behavior trios. In nutshell, the trio of behaviors such as EIBF, EBF & IYCF in the first 1000 days life is the independent variable of this article & the development of deciduous teeth is the dependent variable. As these behaviors are proven & effective interventions/strategies, the linear correlation that emerges among both the variables is ‘behaviors like EIBF, EBF & IYCF positively impact the development of deciduous teeth’.