I have 5 moths old kitten who is 5 kos in weight(maine coon)and I need to go to Serbia(Europe) for 2 weeks. I have purchased ticket for Czech Airlines flight for me. How big the carrier can be to fit under the seat and is it a good idea *-to take him with me or I should better leave him in the /house and find someone to come daily to feed him and check if he is ok?
You don't say where you are departing from to go to Serbia but the amount of travel for the kitten at a young age would be quite a lot in only 2 weeks of time. It will be better to leave your kitten behind for two weeks, that way you won't cause undue stress to your kitten.
Bring him back a toy mouse from Serbia instead! :)
Happy travels & wagging tails!