Absolutely stunning babies, welcome to the forum, I guess I am on the fence so to speak re collars, I would put the breakaway ones on mine if I could just because I have had one go missing and I know if he had a collar on I would have got him back a lot sooner, but none of mine will keep collars on, I spent a fortune on getting personalised breakaway collars made up for them and within 3 days 6 out of the 10 cats had lost theirs. It doesnt seem to make any difference if you put them on from kittenhood either they just pull them off. Maybe my lot are just strange, but then they probably cant help that with the ridiculous names they all have
But trust me after a week of having the kittens you will be able to tell them apart, Piccalli Polkdot Pants and Gracie Grubby Face look exactly the same (mother and daughter) but you can tell them apart in loads of ways, different meeows, different walks, different expressions and so on. Hope that helps and good luck with the babies xxxx