We're not hard core potty training yet, but we have two little potties plus one that goes on the big potty. I would definitely have two of something because of the "monkey see, monkey do" principle. If one wants to go to the potty, generally both want to and if you don't have two of something you'll likely have at least a fight if not a mess too. :-) All of our potties were hand me downs, but DDs are okay with having different potties. I have one that prefers "her" little potty and one that generally likes the seat on the big potty (I think because it's closer to the toilet paper!). We only have a one story house, but if we had two, I definitely think 4 would be the way to go. Apparently Ikea has some good cheap little potties.
2004-Started TTC; Nov 2007-Lap with endo removed; Jan 2008-Ectopic (mtx); April 2008-IVF #1 (bfp, twin girls); March 2011-FET (cp); June 2012-IVF #2 (bfp, singleton, EDD 3-19-12)
***Twin fraternal girls born at 35w6d in 12/2008***
We had one little potty, plus a seat that went on the big potty. I never had an issue with both of them wanting the little potty at the same time. But, I think you also have to take into account how your house is laid out. Especially in the early days, you want a potty as accessible as possible at all times!
Re: potty training?
We're not hard core potty training yet, but we have two little potties plus one that goes on the big potty. I would definitely have two of something because of the "monkey see, monkey do" principle. If one wants to go to the potty, generally both want to and if you don't have two of something you'll likely have at least a fight if not a mess too. :-) All of our potties were hand me downs, but DDs are okay with having different potties. I have one that prefers "her" little potty and one that generally likes the seat on the big potty (I think because it's closer to the toilet paper!). We only have a one story house, but if we had two, I definitely think 4 would be the way to go. Apparently Ikea has some good cheap little potties.
***Twin fraternal girls born at 35w6d in 12/2008***