Hi there! I just purchased the Letters and Numbers Book 1 for my 4 and 3 year old. My question is in regard to the mini units. Is it necessary to purchase any of those and if so, what are the must have ones? I also understand that those work as they get older as well. I just want to know what (if any) I should purchase in addition. Thank you in advance!

Posted by Deleted (45a32367) at 2021-01-27 03:45:05 UTC