Hello, Oksana!
Maybe, these links will be helpful for your purpose.
https://www.fredisalearns.com/english-courses/
http://www.cambridgeenglish.org/learning-english/parents-and-children/activities-for-children/
http://www.kidsworldfun.com/learn-english/
You can try these two sites:
https://learnenglishkids.britishcouncil.org/en/helping-your-child/how-start-teaching-kids-english-home
https://www.englishclub.com/babies/