Keep your eye on the the one you call Brown collar; it sounds like that's the runt of the litter, so it may have trouble getting a really good teat. May need a bit of supplemental feeding to thrive.Looks like two sets of twins - one pair of white and brown and one pair of dark brown - and one lone grey one.
Grey: 100g
White collar: 103g
Brown collar: 94g
Fat brown one (I can NOT tell these two apart other than that one is tubby and i know that's not consistent, not sure what to do): 128g
Little brown one: 99g
Congratulations, to both you and Mamma. She looks very relieved, and slightly smug over a job well done. The kittens are, of course, adorable.
Margret