Everyone has excess milk when their bub is born. Those first few weeks, your body doesn't know how much your baby will need, so produces HEAPS! LOL! That's why you get engorged in those first few weeks after birth.

You don't have to express it. You just leave it in your boobs. That way your body will 'learn' how much your baby will need, and in 3-4 weeks your boobs will suddenly become softer (which is when many new mums start thinking they don't have enough milk) and will only produce as much as your bub needs. Your baby won't need expressed milk if you're exclusively BFing. Your body will provide every single bit it needs.