On my birthday the other day (the 25th) my friend took me to an acquaintance whose cat just had a litter of kittens. I took my Canon 55D with me and tried to take as many nice shots as I could (check my gallery for the five best photos.)
It was very tricky though, as it was rather dark in their livingroom and the kittens move about so much. I had to try to balance graininess and blurriness, unfortunately I almost always ended up with one of the two. The majority came out blurry and unfocused haha, but I still had lots of fun while struggling to get a nice picture.
I'm not sure how old the kittens were, they had opened their eyes about a week ago and were just old enough to get active and explore a bit. So they were still veeery tiny, and they were so fluffy!!