Wash the sweet potato thoroughly in running water. Pat dry and peel it. Make small chunks and place them in a steamer basket.
Steam the sweet potato chunks for 15-20 minutes or until they are soft.
While the sweet potato is getting cooked, clean and wash the baby spinach leaves thoroughly.
Add the spinach leaves to the steamer basket when the sweet potatoes are almost done that is during the last 2-3 minutes of steaming. Put off the flame after 3 minutes. Allow the spinach and sweet potato to cool a bit before making the puree.
Next in a grinder jar, pulse the steamed sweet potato and spinach leaves to get a smooth puree. You may add little drinking water to thin out the puree as per the desired consistency.
Reheat the puree again and serve it to the baby, while warm. You may add pinch of black pepper or roasted cumin powder to the puree just before serving.