I'm nursing my 3yo again. We cut way down, starting at around 9 weeks, because I had a very rough first trimester. I have no idea if her latch is still good enough that she is getting any, as she often went days without nursing. Luckily, she can follow directions now, so we have been working on what hurts me and what doesn't.
I am 37+3, and I can nurse her without pain most of the time, and she is nursing several times a day again. I really doubt she is getting much colostrum, though I hope that when the baby comes, and the flood begins, she will put on a little weight.
Oh, and now I have a tool to get her to hold still so I can brush her hair! I sit on the edge of the bed and she stands in between my legs and latches while I brush her hair. She had dreadlocks until we started nusing daily again!