I had low supply issues with my DS (now 20mo) would up supplementing with formula starting at around 7mo. I used Dom to keep up as much of a supply as possible until I decided to try to conceive again, at which time I weaned off of it completely since it's not safe for pregnancy. I am still nursing DS...mostly at night though. He nurses to sleep at night, 3-5 times during the night, and in the morning before we get out of bed. He drinks formula from a bottle while I am at work all day. On the weekends he still likes to nurse and I let him on demand, but he does consume more formula than BM even when I'm home all day. However, he shows no real signs of weaning any time soon even though my supply has really dropped now that I'm 16 wks pregnant.
My question is, should I even consider tandem nursing considering the low supply issues I had with DS? I will be in a different situation this time around because I was home with DS for 18 months, but I will have to return to work full time when the new baby is 3-4 months old. I know that exclusive pumping during weekdays will already impact my supply. Although I do plan to have some Dom on hand at the first sign of a problem. I really want to EBF the new baby for a minimum 1 year. I'm really afraid that once my milk comes in after the baby is born, DS will be so excited that he'll increase his nursing so much that it'll jeopardize my supply for the newborn.
Sorry if I'm rambling and this doesn't make any sense.