hi, i would appreciate some advice about expressing breast milk. My 6 week old son was low birth weight 5 4oz and recently because of concerns of him not putting on enough weight, generally unsettled after a feed and bringing up large amounts of milk back, i have been expressing and giving him my breast milk via bottle. However despite having good quantities of milk, he is not putting on appropriate weight and he is unsettled and hungry after feeds. I feel that the expressed milk milk is not satisfying him and wondered wether he wasnt getting enough of the hind milk. my milk appears thin and there doesnt seem to be much creamy milk. My sister suggested trying him with a bottle of formula and this seemed to settle him and satisy him. I want to continue breast feeding but as he is on the lowest growth centile I'm worried that he is not receiving adequate nutrition. The coliky type, symptoms and discomfort he experiences seem to disapear when he is given formula. Any advice would be welcome, thanks!