They are great on steps because the wheels are large, if you link me the one you are looking at then I can tell if it has a seat from the listing.
Re how long they last, there are 22 months between mine and I used it for 15 months, it would be great with a buggy board, as then they would go underneath the handle, better for back, no arching.
I have a hobby which means we are out for super long days, with lots of walking, the powertwin I have now is mostly used for DD and my equipment, but then when DS has had enough of being out all day, he does in otherwise Id have stuck to the Bertini and buggy board, DS could sleep in it at nearly 4 (in main bit). In the powertwin, if we go to a festival or something, they both can sleep in evening
It wasnt DS size that was the issue, it was that DD couldnt sit up properly. The Bertini Toddler Seat could cope with a fulll blown 3.6 year old tantrum!!!!
If you want to see some piccies, I have a FB account with no personal or identifying information, I could chuck them up there and show you by pming public link, then delete them, fine by me.
Fford late pregnancy I tended to sleep in a nursing chair, I couldnt lay down and I got more rest that way.
Exexe glad party went well, I found with each pregnancy symtoms started earlier, midwife said it was because you are more aware of your body and what is happening.
HPBP full fat coke works wonders for movement. "'haptonomie'" sounds wonderful going to google that.
Bytheseaside enjoy the sunshine :)