synÂ·theÂ·size (sÄ­nâ²thÄ­-sÄ«zâ²) v. synÂ·theÂ·sized, synÂ·theÂ·sizÂ·ing, synÂ·theÂ·sizÂ·es v.tr. 1. To combine so as to form a new, complex product: His works synthesize photography, painting and linguistic devices (Paul Taylor). 2. To form or produce by chemical synthesis. 3. To produce (sound or music) by means of a synthesizer. v.intr. To form a synthesis.
The causes of preterm labor and premature birth are numerous, complex, and only partly understood. Medical, psychosocial, and biological factors may all play a role in preterm labor and birth. There are three main situations in which preterm labor and premature birth may occur: Spontaneous preterm labor and birth.
1 Placenta previa. 2  This condition occurs when the placenta partially or totally covers the cervix â the outlet for the uterus. 3  Placenta previa is more common early in pregnancy and might resolve as the uterus grows.4  Placenta previa can cause severe vaginal bleeding before or during delivery. Placenta previa can cause severe vaginal bleeding before or during delivery. 2  A C-section delivery usually is required if the placenta previa is present at the time of delivery. 3  Placenta accreta. 4  This condition occurs when the blood vessels of the placenta grow too deeply into the uterine wall.