Welcome Annalise_Jay
I’d love to see some photos if you can upload any. 9week old nethies sound adorable.
It sounds as if you are doing everything fine.
Mixing the old and new feed is certainly the way to go. What sort of hay are they eating? Young rabbits do fine on alfalfa (lucerne) hay but you can mix other grass hay in to get them used to that. If they are already on just grass hay, that is fine.
How sensitive are they to heat!? They’re kept inside and my house tends to get hot in the day and cold at night, I’m trying my hardest to maintain a constant temperature but the house is very temperamental!
Rabbits do much better in the cool temp then the heat. How warm would you say it is getting in the house? You can always put frozen water bottles in with them. If they get too warm, they can sit by those.
They sometimes sit with their ears flat back or really stretched out on their bellies- is this them being relaxed or belly problems !?
Id say fairly relaxed if lying stretched out on the tummy. If they keep re-adjusting and pressing the tummy downwards, then there may be some discomfort. But it all sounds good to me.
This is a good site to become familiar with rabbit body language: http://language.rabbitspeak.com/
They’re due to get vaccinations on Friday and microchipped and they’ll get neutered at 4 months
If you don’t mind saying, where do you live? There are a few vaccines now available in the UK and some European countries. Only one available here in Australia where Im from.