Per the American Academy of Pediatrics, babies should sleep flat on their backs. But playtime should happen on their tummies. In fact, the day you bring your infant home, he or should should spend short period of time on the stomach two to their times per day because “tummy time prepares babies for the time when they will be able to slide on their bellies and crawl. As babies grow older and stronger they will need more time on their tummies to build their own strength.” A tummy time mat should be easy to clean because babies spit up and drool. A lot. It should have a variety of engaging things for them to grab, pull, yank, or shake. By the time they hit five months, babies see a solid spectrum of colors, so go for bright, varied hues and patterns. At around the same time, they also develop depth perception and are able to see a three-dimensional view of the world, so make sure the mat has plenty of objects they can play with. As for size and shape, that’s your call. Every product on Fatherly is independently selected by our editors, writers, and experts. If you click a link on our site and buy something, we may earn an affiliate commission.