I don't know, sort of. Ds was 4 in March & a little bit into this pregnancy, he told me there wasn't any mookie coming out. He continues to latch on but still insists there's no mookie (& I can't express any.) The other night we talked about it & I told him that once Turkey came, there would be TONS of milk. He asked if he could still have some & I told him that he'd need to remember how to nurse. So he latched on for about 30 seconds to make sure he remembered.
I'm totally fine with him "practicing" now & then & actually would like for him to tandem for a little while once Turkey comes. I may regret this, we'll see.
Dd2 nursed right on through my pregnancy with Ds, but she was a year younger than he is now. She continued to tandem for 3 months until I kind of pushed weaning, which was really sad. She didn't cry over it, I just didn't sit down near her, but it made me sad because she wasn't ready (at 3.5 yrs
BUT, it made the transition SO much easier for both of us. I always have too much milk & end up engorged with plugged ducts that sometimes progresses to mastitis, but with Dd2 still nursing, she was a pro at draining the "dushies" in no time. So that worked well for me. I think Dd2 had an easier time accepting a new baby in the house because they shared the nursing times. But I think it was really, really draining for me. I had lots of hormonal problems after Ds and some severe adrenal fatigue & I've always wondered if tandem nursing (& nursing during pregnancy) played a part in it. So maybe I shouldn't encourage the latching on right now. Sigh.