We have a litter of 2 1/2- 4 1/2 week old babies (3 belong to the momma and 3 she adopted, thus suggesting different ages) and any time you startle one they'll give you the tiniest hiss (and then roll over for you to pet their belly, ) It is the most adorable thing ever.
That is too cute. I think the cutest little hiss I've ever heard was from about a 4 week old feral kitten. I picked her up, she looked at me and gave me her best hiss followed by a spit. I have never laughed so hard in my life. I just told her she was very scary & continued to hold & pet her.