Background: Breathing brings oxygen in to lungs. Nasal breathing is considered to be normal whereas mouth breathing are often associated with problems like dryness of mouth etc. Both nasal as well as mouth breathing provides oxygen to lungs however there is difference in oxygen level absorption. Aim: The aim of this study was to compare the breathing pattern in mouth breather and normal healthy child. Material and method: The sample size selected for present study was 60 subjects. Samples were divided in two groups, study group included 30 children with mouth breathing habit and control group consisted of 30 children normal breathing. Plethysmography was used to analyze variables like, tidal volume (Vt), respiratory frequency (f), minute ventilation (VE), inspiratory duty cycle (Ti/Ttot), mean inspiratory flow (Vt/Ti), rib cage motion (%RC), inspiratory phase relation (PhRIB), expiratory phase relation (PhREB), and phase angle (PhaseAng). Pulse oximetry was used for peripheral oxygen saturation. Stastical analysis was done. Result: a total of 60 samples were included 30 in each group. A total of 4,822 respiratory cycles were analyzed, 2,512 of which corresponded to MB and 2,310 to NB. No statistical difference was found in respiratory pattern of both groups. Conclusion: we conclude that mouth and nasal breathing are very similar in children