Match the following:

A. Phenyl Ketonuria (PKU)	1. Too little thyroid hormone
B. Microcephaly	2. Very small brain
C. Hydrocephaly	3. 47 chromosomes
D. Cretinism	4. Lack of an im portant enzyme
E. Down Syndrome	5. Excess of cerebrospinal fluid
	6. Caused by a lack of oxygen at birth