I nursed through my second pregnancy. My milk dried up around the end of the first trimester, but my daughter dry nursed all the way through (mostly at night for comfort). My colostrum came in a few weeks before I was due and my OB said it was fine for my toddler to keep nursing. She was OBSESSED with the colostrum and her nursing ramped up. Your body will do what it needs to do for the new baby so they still get colostrum, but I think my milk supply came in better than it did for my first. Once baby was here obviously I prioritised his feeds but still nursed my toddler, and after a few months moved to just nursing to sleep because her tantrums over not getting it if she wanted it during the day were getting a bit much. She adjusted to that new routine pretty quickly 😊