So if a full moon means the world is extra, it's only logical a blue moon means a whole different level of activity and myths. (romper.com)
[It] is commonly presented in the form of a «learning pyramid» which shows precise percentages of material that will be retained when different levels of activity are employed. (teachermagazine.com.au)
And also babies could be going through growth spurts, different levels of activity so there are quite a few reasons actually why we would see variations in weight gain. (pregnancymagazine.com)