The needle to promote fetal lung maturation, also known as the lung promotion needle, will not have significant adverse effects on the fetus if the drug is used correctly, but if used improperly, the lung promotion needle, as a hormonal preparation, may have some effect on the development of the fetal skeleton. Clinically, lung promotion injections are often applied with glucocorticoids such as dexamethasone and betamethasone, with dexamethasone being the first choice, administered intravenously, intramuscularly, and through the amniotic cavity. There are clear indications for the use of lung promotion injections, and they are used less frequently and for shorter periods of time, and usually do not have significant adverse effects on the fetus. Pulmonary stimulation injections are usually used in pregnant women in the middle and late stages of pregnancy when preterm labor and premature rupture of membranes occur. It is usually applied within 24 hours to 7 days before delivery, which can promote the maturation of fetal alveoli and thus significantly reduce the occurrence of neonatal respiratory distress syndrome.