playpen with mat for babies and toddlers
https://www.honkaistarrail.wiki/index.php?title=10_Fundamentals_About_Baby_Crawling_Mat_You_Didn't_Learn_In_School
Make sure to check your mat often for signs of wear and tear such as threads falling loose, or damaged foam. Repair or replace the mat if required. Always keep it in a dry place to prevent the growth of mold.