Fetal development: The first trimester
If given expert postnatal care, some preterm babies weighing less than 500 g (1 lb 2 oz) may survive, and are referred to as extremely low birth weight or immature infants. It is rare for a baby weighing less than 500 g (1 lb 2 oz) to survive. Low birth weight increases the risk for perinatal mortality (death shortly after birth), …
