I made my grand-daughter Luca Jay a helper stool when she was about 13 months old. This allows her to stand up at the kitchen counter and “help” mom and dad work in kitchen. It’s nothing fancy, just Baltic Birch plywood, but it’s sturdy, and adjustable in height as she grows. It only took me a couple days to make the stool and was a nice surprise for my son and his wife when we came to visit!
Here’s a funny update to this story. When Luca was about 17 months old, she decided that she didn’t want to sit in her high chair anymore to eat meals, and now she will only eat her meals while standing at the counter in her helper stool. Our son and his wife actually moved the high chair to a closet in the basement. Luca just climbs up onto her helper stool anytime she wants a meal now!
The stool is 19″ wide, 20″ deep at floor level (15″ at the top) and 36″ high. The shelf that she’s standing on can be adjusted in height so that it’s either 12″, 15″ or 18″above the floor. It’s set at the 18″ height in these images.