Quoting MommaSav2:" I am still breastfeeding my 21 month old and I'm about 12 weeks pregnant (we think) and it is extremely ... [snip!] ... who are tnadem feeding, Advice? Do you like tandem feeding? Is it uncomfortable? How does your toddler feel about sharing?"
I don't remember completely what it felt like breastfeeding during pregnancy but I know it got better. I was usually very sore for the first 20 seconds and then it got much better. However, I would have to re-position my daughter often.
I have had mixed feelings about tandem nursing. Most days I love it. Early on in my son's life (he is now 2) I only enjoyed it sometimes and usually nursed them separately, the sensations were overwhelming (my son was tongue tied and had a terrible latch, it didn't stop being painful until he was about 4 months).
Around 4 months or so, I usually nursed them together. It was fun most of the time and saved a lot of time, but they did push each other and fight over space occasionally.
Now, I usually nurse them together (when the older one wants to nurse), however, I still have times that I would prefer to nurse them separately (I think that my have to do with the time of the month and sensitive nipples though, I keep meaning to keep track, but I've only had two periods so far - yay breastfeeding
My daughter had no problem with sharing. She only showed jealousy once towards her baby brother, when he was 2 or 3 days over Grandpa held him, Tessa was very upset. Other then that, she has been very affectionate towards him (now they fight over toys and space sometimes but they are usually on happy terms with each other). I have heard that breastfeeding them together can reduce the jealousy, however, I have no way to know if it made any difference
We have changed positions so many times over the last two years. Right now, they are 2 and almost 4, I usually nurse them reclined on the couch or sometimes in bed in a semi-seated position (with lots of pillows). I had a rocker/recliner that I used a lot until it broke, I would recline almost fully and have a pillow under each arm. When my son was a new baby and they nursed together, I would position him and then invite my daughter to join us, she would usually kneel beside me and turn towards me, or we'd have lots of pillows.
Your child may wean on her own when your milk supply drops, or she could keep going. She might be easier to wean or you may accidentally encourage her to wean by restricting her nursing sessions (because it hurts). Best of luck with whatever you decide to do.