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Lack of tummy time causes developmental problems
See? Not putting kids on their tummies can cause lifelong problems, but there's still no evidence that germs that may or may not be on your floor cause anything other than development of the immune system, and no evidence that babies crying because they don't like tummy time causes anything other than increased frustration tolerance and practice on the parent's part of setting limits. Oh, plus you can spend all that money on more worthwhile things than several baby-restraining contraptions in each room.