Thanks for asking your query here. Betnesol is a steroid medication which is prescribed to help maturation of lung for the baby in womb. If a baby is born at 37 weeks, there is no need to give it as the lungs are mature at that age. However, when there is a slight risk of premature delivery before 37 weeks, it is very advisable to give Betnesol for lung maturation. I agree with your concerns about side-effects, but the risk-benefit ratio will suggest the benefits to be much higher taking Betnesol. Thyroid issues are not contra-indication for steroid injection treatment during pregnancy. I would recommend and agree with your doctor about steroid injection. Usually it is a 2-dose therapy (2 injections given 12-24 hours apart). I hope I have been helpful Regards Dr Tejas Shah Neonatologist