I can't answer the when question for you Mel but definitely start storing it. They can use it to treat a low blood sugar instead of formula......My friend is about to give birth to number 2 and she ahs been storing since about 36 weeks. Also you can insist they don't feed bubs with an n/g tube or a bottle......with her no.1 bub the nurse at frances perry house showed her how to feed with a teaspoon at the same time as using the little finger inside the mouth to stimulate the baby's suckling reflex......it makes them work a bit harder for their milk and makes transition to the breast so much easier. She breast fed successfully till 8 months when timothy decided he'd had enough and wnated to explore the world!!