A working knowledge of the key features is helpful in understanding FASD diagnoses and conditions, and each is reviewed with attention to similarities and differences across the four diagnostic systems. More than 400 problems, however, can occur with FASD. Growth
In terms of FASD, growth deficiency is defined as significantly below average height, weight or both due to prenatal alcohol exposure and can be assessed at any point in the lifespan. Growth measurements must be adjusted for parental height, gestational age (for a premature infant), and other postnatal insults (e.g., poor nutrition), although birth height and weight are the preferred measurements. Deficiencies are documented when height or weight falls at or below the 10th percentile of standardized growth charts appropriate to the population. Prenatal or postnatal presentation of growth deficits can occur, but are most often postnatal.Criteria for FASD are least specific in the Institute of Medicine (IOM) diagnostic system ("low birth weight..., decelerating weight not due to nutrition..., [or] disproportional low weight to height" p. 4 of executive summary), while the CDC and Canadian guidelines use the 10th percentile as a cut-off to determine growth deficiency. The "4-Digit Diagnostic Code" allows for mid-range gradations in growth deficiency (between the 3rd and 10th percentiles) and severe growth deficiency at or below the 3rd percentile. Growth deficiency (at severe, moderate, or mild levels) contributes to diagnoses of FAS and pFAS, but not ARND or static encephalopathy.Growth deficiency is ranked as follows by the "4-Digit Diagnostic Code":
Severe: Height and weight at or below the 3rd percentile.
It is related to the advocacy model but promoted at a systems level (rather than with the individual or family), such as developing community education and supports, state or province level prevention efforts (e.g., screening for maternal alcohol use during OB/GYN or prenatal medical care visits), or national awareness programs. Several organizations and state agencies in the U.S. are dedicated to this type of intervention.The US Centers for Disease Control estimates 3 million women in the United States are at risk of having a baby with FASD, and recommended that women of child-bearing age should be on birth control or abstain from drinking alcohol as the safest way to avoid this. Prognosis
The prognosis of FASD is variable depending on the type, severity, and if treatment is issued.Prognostic disabilities are divided into Primary & Secondary Disabilities:

Primary disabilities
The primary disabilities of FAS are the functional difficulties with which the child is born as a result of CNS damage due to prenatal alcohol exposure.Often, primary disabilities are mistaken as behavior problems, but the underlying CNS damage is the originating source of a functional difficulty, rather than a mental health condition, which is considered a secondary disability. The exact mechanisms for functional problems of primary disabilities are not always fully understood, but animal studies have begun to shed light on some correlates between functional problems and brain structures damaged by prenatal alcohol exposure.