New here

Hi everyone!  I'm new to this board.  I'm mainly just lurk over the age group boards.  But my LO was born in August and so I was wondering...are any of your LOs not crawling or pulling up yet?  DS doesnt crawl, pull himself up, or get into a sitting position on his own from laying down.  His pedi didn't seem too concerned but every time someone asks if he's crawling yet and I say "no" they act super surprised like "he's not?!?!?"