I am expressing for 6 day old large baby (was 9lb 3oz) as my nipples have become open weeping sores so bf is too painful. He has gone through a massive feeding frenzy since last night due to a growth spurt. As I have only just started expressing I don't have any reserves and am struggling to keep up with his demand. Can any one help with suggestions as to how I can quickly increase my supply. Also how long is this growth spurt likely to last??? I have no formula as wanted to avoid but everywhere is closed so don't have a back up!!