My kitten Riley is about 4 month's old now, and is terrified by anyone but me in my apartment. When I adopted him at 2 months, he was quite outgoing at the shelter and didn't seem particularly shy or skittish when I was handling him. When my sister visited a couple weeks after the adoption, she was able to hold and pet him and he would be purring in her arms. Fast forward to recently, my mom came to stay for the weekend and for a whole 2 days Riley hid in my bedroom, she would nicely approach him speaking in a soothing voice and he would run under the bed. My sister didn't even have any luck with getting near him. Around me, he's extremely affectionate and lays with me whenever I'm on the couch and sleeps near me every night. I'll admit I'm a bit of an introvert so having company over doesn't happen often and it's usually family so I'm worried I'm not socializing him enough. My other cat (2 years old), however, is very sociable and is always present when there's company so I'm hoping he'll grow out of it? I'd love to hear some experiences of those with shy kittens, if they grew out of it or any tips/advice, thanks!