My baby is 2.5 months old and i am giving him brest milk only, for a some reason i have to go out for 5 hours an i am planning to keep brest milk for him in my absence and i have 60 ml milk bottle, so i wanted to ask can 60 ml milk will be enough for my baby for 5 hours or i should take big bottle, my babies weight is 4.6kg, at the time of birth he was 3kg.