You're not the first to notice this. The phrase "ontogeny recapitulates phylogeny" was coined to capture this very observation: https://en.wikipedia.org/wiki/R

You're not the first to notice this. The phrase "ontogeny recapitulates phylogeny" was coined to capture this very observation: https://en.wikipedia.org/wiki/Recapitulation_theory https://en.wikipedia.org/wiki/Recapitulation_theory (unfortunately, the theory wasn't very useful, and is mainly a historical curiosity today.)