Take this child’s bowl that has been designed with a built in container to hold hot water to keep the food stored in it warm.
It’s still very functional, but with the advancements of electricity and the invention of hot plates or warmers (or even microwave ovens, for that matter) it has become easier to keep your kids food warm.
It has a built in spout with a removable lid so that you can get the water in and out with no problem.
All you have to do is pour some warm water in the spout, seal it up, and you’re good to go. It’s kind of like the modern travel mugs that we have today.
You can see the child’s bowl with a matching mug that I mentioned here in my TIAS shop here.