Wow, that's pretty neat!
But yeah, I don't see how they would stay in there!
Just like my little IUGR 700-gram 32 weeker ...... she's so dang WILD! I have her all nestled in a huge roll, tucked in tight. Then I go to check on her because I see her pulse ox waves movin' ..... I peek in there and she's got her head butted against the porthole. Why stay all cuddled up in a nice, warm roll that your nurse just made you when you can have your head smashed against a cold, hard porthole door?!