Tzniut and children

Is it permissable for a mother to be undressed (such as to change clothes or shower) in front of a young daughter (under two years of age)? If so, at what point is it inappropriate? Thank you for your time in answering this.

Before your daughter is old enough to talk, there is no problem at all. Afterwards you should use your judgment so that your behavior does not impinge on the respect your daughter shows you or compromise your privacy. Your actions should be such that your daughter is able to see you as an example of modest behavior that she can later emulate.