Water is a transparent and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms. Its chemical formula is H2O, meaning that its molecule contains one oxygen and two hydrogen atoms, that are connected by covalent bonds.
1. recently born; called also neonatal. 2. newborn infant. postmature newborn (post-term newborn) post-term infant. premature newborn (preterm newborn) preterm infant.
Neonatal withdrawal syndrome, generically termed neonatal abstinence syndrome (NAS), is a complex disorder. It is defined as a constellation of behavioral and physiological signs and symptoms that are remarkably similar despite marked differences in the properties of the causative agent.ithdrawal is generally a function of the drug's half-life; the longer the half-life, the later the onset of withdrawal. A longer half-life is also associated with a decreased likelihood of neonatal abstinence syndrome in the infant.