Speedy development?

I swear my son has learned 3 months worth of development in two weeks, is that normal? In the last two weeks he learned how to crawl regularly, learned how to sit up and go back down to his stomach and then sit back up again, and just this morning he tried to pull himself up to standing in his crib and did some yoga before breakfast. And he got two teeth and is eating everything from pasta, toast, to fruit, to waffles!! I know he is 9 months tomorrow and this is all normal development, but I feel like he was lagging behind because of his ear infections and all of a sudden he can do ALL. THE. THINGS! 😳