Your new born immune system is developing for first 6 months. So your new born is easily prone to bacterial infection. Bacteria are present in Air as well. Soap and water can make baby feeding bottles clean but does not make it free from Bacteria. Hot sterilization is effective old age technique to kill bacteria. Traditionally boiling water sterilization is preferred by mothers but that has many side effects like deformation of plastic bottles, nipples and other baby accessories, unsafe, needs lots of time. We understand this pain of mothers.
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