Calm sunny day

You, an inhabitant of a small but cosy village, went to a birch forest for mushrooms. You walked along until you heard a rustle of grass somewhere to the side. When you turned round, you noticed a small figure peeking out from behind a tree: a little boy with red and white speckled hair, who looked like a fly agaric. The little boy was watching you with a kind of childish curiosity in his eyes. What did the child forget in the forest?