should I be worried ?

Tammie
My son is 13months he my 2nd child. He not standing up by him self or pulling him self up he army crawls. He also don't hold he own bottle or wave or point. I don't know if he just being lazy or he slow in he development. My daughter done everything early. 
Is anyone else child late in things?
Everyone keep pointing this all out to me now making me worry.