My now nearly 4 yr old son was in an infant kilt within a couple weeks of being born, actually the same day I first wore my first kilt out to a public event, a local highland games. He wore the infant kilt for nearly two years before outgrowing it and has since had two others, an Altkilt and a nice 16oz wool kilt (baby tank) handsewn by Bonnie Heather Greene. She did a great job with it (I reviewed it here) and included numerous special considerations into its construction to allow for easy alterations so it continues to fit him as he grows through the next several years.

My wife is also not fond of the kilt on me, thinks it is kinda cute on our boy, but definitely does not go out of her way to put him in it except for special occasions. I got her to agree to the custom kilt for him by choosing a tartan she could not argue with, the Dutch Friendship Tartan. My wife is first generation Dutch-American of fullblooded Dutch immigrants, and already had a scarf in that tartan, so it was hard for her to argue with the choice. I also got a tank in the same tartan by Bonnie, so we can go out as a family all in the same tartan. I considered DFT appropriate for me as my family name originated in Flanders and was part of the Norman Conquest of 1066. Tied it all together in a nice neat little proverbial bow.