Yeah, your milk is different to that of a new mum, but it is in no way bad.

I dont think toddler breastmilk would be worse than formula. I think the main change would be the colostrum, and if shell can feed for a few weeks before you take over, than bub will still get the best of both worlds!!

Weaning then relacting could be tricky, not everyone relactates, it can be very difficult, so you could run the risk of not having breatsmilk at all. You could also be stuck on the meds for quiet a while too.

Tough call, but personally I would just coninue with current bub, and take over the new bub when partner has finished. I cant find a reason why any breastmilk wouldn't be better than formula, if you can.