Keep in mind that toddlers tend to go through rapid growth spurts as well as slow periods. (babycenter.com)
During a period of frequent, violent collisions among the protogalaxies, their resident black holes experienced rapid growth spurts by merging with one another and gobbling up new supplies of gas and dust. (discovermagazine.com)
Keep in mind that children tend to go through rapid growth spurts as well as slow periods. (babycenter.com)