Hi im having trouble listing these as ordinal or nominal, interval or ratio

I have done as follows, could you possibly advise?

Head circumference (cm) =ratio

Length of baby (cm) =ratio

Birthweight (kg) =ratio

Gestational age at birth (weeks) =interval

Maternal age (yrs) =ratio

Maternal smoking status (non smoker:smoker) = nominal

Maternal height (cm)=ratio

Mother's pre-pregnancy weight (kg) =ratio

Father's age (yrs) =ratio

Years father was in education =ratio

Number of cigarettes smoked per day by father =ratio

Father's height (cm) =ratio

Low birthweight baby (low birthweight:not low birthweight)=nominal

Number of cigarettes smoked per day by mother =ratio

Maternal Age =nominal

Birthweight (lbs)= ratio