Anthropometry

Right. Here's what I think needs to be done to get better information on the degree and implication of over/underweight in pregnancy.

BMI for everyone.

Weight gain for everyone-  prepregnancy, at booking and weight on admission for delivery.

Mid-upper arm circumference measurements for women with hyperemesis to assess possible prexisting under-nutrition and better identify those who need nutritional support.....also for women with BMI < 19kg/m2 at first visit.

Triceps skinfold for BMI>30kg/m2 at first visit to differentiate between obese and fit/high lean muscle mass. Maybe?

Basically, refer the latter groups for dietetic assessment. Now for further literature review and a policy and a protocol document....fun, fun,fun!