(a) Small-for-gestational age (SGA) refers to an infant born with a birth weight less than the 10th centile.
(b) Large for gestational age (LGA) baby can be defined as a baby that weighs more than 95 in 100 babies (the 95th centile) or more than 4,000g to 4,500g.
(c) Intrauterine growth restriction (IUGR) has been defined as the rate of fetal growth that is below normal in light of the growth potential of a specific infant as per the race and gender of the fetus.
(d) Gestational age is the common term used during pregnancy to describe how far along the pregnancy is.
(e) Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks.
(f) Postterm pregnancy is when a woman has not yet delivered her baby after 42 weeks of gestation, two weeks beyond the typical 40-week duration of pregnancy.