I agree with everyone else responses Angel... I do not see anything wrong with not having left Kynan with other people before, and nor do I think you 'need' to...
It sounds like Aidyn has a pretty similar personality to Kynan, and was a very shy bub, who got upset at loud noises and strange people, and wouldnt venture too far away from us.
However as he has grown older he has become more used to situations like that and deals with them better.
I can count on one hand the amount of times that Aidyn has been watched for an extended time by somebody else...

Remember when I was at the BB Conference, and DP was meant to be looking after Aidyn up here in Brissy, but got called into work, and MIL had to come up to watch Aidyn for the whole day... I was freaking out, as Aidyn had never been in a situation without Mummy or Daddy before, but he actually coped really well... and that is probably because he remembered who MIL was...

So I do agree with Mels idea that it would be good to have another person that Kynan can get used to JIC of an emergency or something. Not suggesting that you would even have to leave him with them, but is there maybe someone close to you and DH who you visit regularly that Kynan will become familiar with?

But anyway... I honestly think there is nothing wrong with you not wanting to leave him with anyone else...
Try not to let other peoples judgements and opinions sway you... you know Kynan best, and he is afterall still only very little. I think you guys have such a beautiful relationship, and you are a wonderful devoted mother.