We have not been weighing them, but the difference in size is readily observable. She is one year old and her kittens arrived the day after her birthday. This is her first litter, and she seems to be enjoying it, although a quiet snooze for an hour or so on our bed away from the new demands is always welcome. She was going to be an indoor cat, but escaped one day, and came home with the Russian blue, the Hussy, after which it seemed pointless keeping her in. They hung around together for a couple of weeks, she, shy and demure, he ardent and passionate. Then he legged it.
We had always wanted her to have kittens as she is so beautiful. her name by the Way is Katya. Named by my wife, Who as it happens is Russian. Her sister disappeared last Friday around mid-day and has not been since which is sad as we don't know what happened to her, she just vanished around mid-day. Which is strange as she doesn't like to be too far away from her food bowl normally.