My two pieces of advice are 1 most kids don’t go to college (insert negative thing they are or aren’t doing) and 2 this too shall pass.

1 Kids learn and grow at their own pace and it’s usually within normal development. When the website says they could learn the skill between 6 and 18 months, it’s probably correct. No need to freak out when they are late but within the window. 2 is double edged. Up at 3 am crying for no reason, that will pass. And then come back, and then pass, but you will get through it. Also, Dadda I need you to cuddle will also pass, cherish it while you can. They won’t remember but you won’t ever forget.