If you want a proper baby seat for your young'un during your transfer to Arillas, ask Theo at Arillas Cars, advertised on this website.
http://www.corfu-carrental.com/ He will sort it out. But you will be able to carry him/her in your arms in any taxi if you wish.
Which villa do you mean? The owners will certainly organise what you need. Don't be afraid to ask them. I know several of them and they do more for their guests than is reasonably expected. Linakis, Theia...
Have a typically wonderful stay in Arillas, and tell us all how you got on. I can almost predict what you will say, about how you enjoyed.
Very best wishes
Phil