if this is for real, you need to speak to a MW urgently about feeding your baby
you absolutely cannot give doorstep milk to a baby , your baby cannot digest it and can quickly get dehydrated and v v ill
do you know about sterilising bottles etc?
what milk did you use in hospital>
did the midwife not disucss this ? it is usual practice for a MW to discuss how you intend to feed your baby before you are sent home
you need infant formula, the first type,
it is available at every supermarket
ensure you get one suitable from birth
you can buy ready made formula too which might be easier for you if you are not sure about formula feeding
you must not use regular doorstep milk, or regular powedered mikl, it is infant fomrula only