The residual level of BPA in PC was reported in the range of 1 -70 mg/kg of the polymer . One value of 140 mg/kg of residual BPA in PC was reported for a batch of baby bottles but was found to be lower than 26 mg/kg in a second batch of the same brand . Migration of BPA was found to be weakly correlated with the residual level of BPA in PC resins while Ehlert et al found no positive correlation between the residual content of BPA in the polymer material (1.4 -35.3 mg/kg polymer) and the BPA release . Nam et al (2010) observed that the BPA migration from PC bottles increased with prolonged usage. In this study, the authors reported concentrations of BPA released from brand-new PC baby bottles in the range of 0.03 ppb to 0.13 ppb at 40 °C and 95 °C respectively while the concentrations increased to 0.18 ppb at 40 °C and 18.47 ppb at 95 °C respectively after been used for 6 months. They noted the spontaneous increase in BPA migration when the temperatures were above 80 °C . The same conclusion was drawn by Neha and Himanshu, (2021) that reported the increased release of BPA from PC drinking water bottles into the water at the range of 0.38 -44.48 ng/mL . Release of BPA into hot water at an ambient temperature was reported by Maragou et al (2009) ranging from 2.4 -15.3 µg/kg for 45 mins and Brede et al reported the migration of BPA within the same range of 2.4 -14. µg/kg . Migration of BPA was also observed to be increasing with time when incubated for 7 days with the amount of BPA migrated from new PC bottles in the range of 0.08 ng/mL (day 1) to 1.33 ng/mL (day 7) and 0.21 ng/mL (day 1) to 0.93 ng/mL (day 7) for old ones. According to the authors, the elevated temperature corresponding to the boiling point of water increased the migration of BPA by a factor of 15 -55 as compared to room temperature . also reported the migration of BPA into boiling water between 1.7 -4.1 ng/mL within 24 hrs . pH also affects BPA migration from PC bottles .