Oh my goodness. This is so great!
In the post she links to both a UK and US place to order. I don't know if both have kid sizes, but they do have baby tops, onesies and bibs.
"Babies are little scientists. You never discover as much in your life as when you’re a baby, this whole world is new, they’re laying down the neurons to figure it out all this. They’re experimenting with their voices, their hands, putting everything they can grasp in their mouths. And yea, I want to make the clothes that my wee kids can wear, that are them."