In Portuguese, from 4yo.
Part of the Mother Hen’s series, the Panda who has lice, is a funny and beautifully illustrated story.
Panda goes to school and he has lice. The teacher turns a situation that could have a disruptive issue for the class to an opportunity to study maths by counting the lice and work together. No so easy when they jump from one animal to the other.
More info here.