They are also designed with air holes that allow baby's skin to breathe. (mymilkybaby.com)
Transfer the mixture to a glass bowl, cover and allow to rest for 3 hours, or until the batter has doubled in size and has lots of air holes at the top. (foodsfromafrica.com)
The ball should have adequate air holes for ventilation and to prevent overheating. (animals.mom.me)