I hear ya with the crusty nips. Have only had it 2 of my pregnancies though. It's definitely the colostrum. I have BF all of mine, and for the 1st few days it's just thick gloop (that's the best way I can describe it) then by about day 3/4 your milk finally comes in and the gloop turns in to proper milk.... Truly amazing what our boobies can do!!!!