V, i know a lot of older generation pple like mil or cl will claim that bm is thinner. actually i personally dun think so.
i pump out my bm and notice that though the first few minutes of our bm is lighter in colour, subsequently the milk is thicker.
anyway, my bb who is 7 week tomorrow will cry for milk every 4 hrs. during the growth spurt, she will cry for milk 2.5 hrs later. it is really regardless whether i give her fm or bm.. ( my bm not enough so i supplement with fm).
However if you are latching her, bb will prob ask for milk faster coz we cant gauge how much milk they have drank and for fm, we know how much they are drinking...
so really dun have to worry that bm is thinner..