Baby delayed?

I follow a girl on Snapchat & we literally had our babies a day apart. My baby was born on the 23rd and she had her son on the 24th. I’ve noticed her son is really picking up on things. He grew teeth before my daughter, he’s crawling right now at 9mo tomorrow he’ll be, & he was eating solids waaaaaay before my baby was. Am i not doing enough with my baby? Is she delayed?