My baby is 18 months old. Now currently facing a issue with milk in flask. Milk is getting sour during night time. If you guys have some better techniques which could help me. I use Pasteurised milk pouches usually purchased fresh from the shop in the evening and boiled thoroughly before use. Then milk is transferred to Milton thermosteel flask (Hot/Cold) since my LO gets up from sleep during night time and needs to be fed desperately by feeding bottles. Unfortunately the milk store in flask around 11 pm gets sour by around 2 am. try to smell the milk to check if it is still fresh or sour. I am afraid that some day, our judgement may go wrong and the worst may happen. If you guys have any excellent way of keeping/storing night time milk along side bed. Help me