First of all - my sympathies - it's hard enough managing this condition in yourself, and controlling it for someone too young to communicate must add a whole extra level of difficulty.

What's the current thinking on a low carb diet for T1 infants?

I'm T1 and during the periods when I've eaten very low carb I had amazing control - once I got my basal adjusted right I was using only tiny amounts of Humalog and my curve was the flattest it has ever been. It felt more like very occasional nudges to something that wanted to move straight, rather than constantly batting back and forth between 2 lines.

That said, I do eat moderate carb these days, because I find that I can still manage good enough control - after decades of practise and with close monitoring and a fair bit of work - and it's more convenient for eating with others, not to mention cheaper. I found my energy levels and concentration on low carb were good after a while, but the process of switching is tough, and it's not something you can easily dip in and out of. If my highest priority was easier and more reliable control with minimal treatment though I would absolutely choose low carb.

I realise that for a growing child, the nutritional concerns would probably be rather different though.