I have been breast feeding my 4 week old son but have got very sore nipples and am not sure if I can continue for much longer (much to my dissapointment) I tried to express and have very little joy there too although over three attempts throughout the day I managed to get enough milk (what is enough though??) to bottle feed him and give my boobs a small rest. That was unsuccesful cos he threw most of it up!! Any one got any advice? also what would be a good formula to try him on? what is a good formula??