my baby girl is 6 m 24 days old but she doesn't hold their neck and not standing in foot what I do

A. See the child does not have a stability of the neck by the time of six months complete it is a delay so please consult the doctor and they don’t stand on their feet all by themselves by holding your hand or when you’re holding the child from the shoulder properly they can stand for a while with that but still they don’t have strength to stand on their own