Do growth spurts really exist, is there any evidence? Every time I feel that I'm struggling to keep up with BF someone suggests that it is due to a growth spurt and advises me to stick with it until it improves in a few days. This strategy has worked so far, and I've appreciated the encouragement but I do wonder whether "The Growth Spurt" really exists or is a convenient phrase to cover all sorts of temporary feeding setbacks. (I also wonder the same about the term "colic" and bouts of crying). What do you all think?