Its all diffrent for all children ive seen some kids not even crawl till the or 8 months old and some didnt walk till almost 2 but usally its crawling between 4-6months and walking anytime after that really. Potty training 2 is a good age to start even a little hefore the 2nd birthday is good
"What to Expect the First Year" would be a good book to read. Answers lots of those questions and plenty more.
My nieve started to crawl at 5 months and was walking by 8 months you never know honestly depends on how much yu really work with them
Crawling is anywhere from 4-8 months
Walking is anywhere from 10-15 months maybe later
And talking my oldest said his first word at 8 months but I've heard of some say it before then
Everyone I know that has girls started potty training at around a year to 18 months but boys usually arent pottt trained until 2-3 years old
My son started walking 3 days after his 1st bday lol nd started potty training at 2 ... I miss those days !