Thanks for writing in.
at 34 weeks is generally between 8 cm to 9.2 cm. So as far as that parameter is concerned, there are concerns about the baby not growing well. I would agree about your physician in terms of monitoring and planning an early delivery since by that the baby's lungs would be mature. In addition, make sure that your wife takes adequate rest, avoids any heavy exertion, has a balanced and nutritious diet. also, her blood pressure and blood sugar levels ( if they were elevated earlier) should be in control.
Hope this helps