Growing too fast.

My little girl is 7 1/2 months and I feel like she's growing way too fast for me. She went from not even being able to sit up by herself and then at 6 months suddenly she's sitting up by herself, and trying to crawl. By 6 1/2 months she was full blown crawling and then at 7 months she started pulling herself up to stand like I thought it would take longer for all of this. She's fast too and I just thought I'd have more time for her as my little baby. When did your babies start crawling? I thought it was supposed to be around 8-9 months but maybe I was wrong.

First time sitting unassisted

First time trying to crawl

First time standing

She used to only do it in her bassinet but now she's trying to do it all the time

Sorry for all the pictures.