गर्भावस्था के दौरान छाती में जलन (heartburn) का प्राथमिक कारण क्या है?

The primary benefit of maternal administration of glucocorticoids in preterm labour is to:

A nurse assessing a woman in active labor notes that the fetal head is the part entering the pelvic inlet first. The fetus has a flexed head with the occiput as the leading bony landmark. Which fetal presentation and denominator is most appropriate?