Answer: Alcohol is the substance that Marvin's mother likely ingested during her pregnancy
Step-by-step explanation:
Any child that was delivered by a mother that drinks alcohol may be prone to many heath issues or disorders. These problems or disorders in children caused by the consumption of alcohol by mothers during pregnancy are referred to as Fetal Alcohol Spectrum Disorder (FASD). Some of the many symptoms of FASD include:
a. Abnormalities of the child's face. The child may possess very small eyes and thin mouth.
b. Shorter height when compared with other children of the same age.
c. Low weight at birth
d. Challenge in learning due to low IQ
e. Impairment in reasoning
f. Delay in speech
g. Sleep problems
h. Poor physical coordination.
Since young Marvin is growing at a slower rate, has a misshapen face, is difficult to soothe etc, She may be suffering from FASD and it is safe to say that Marvin's mother most likely ingested alcohol when she was pregnant with marvin.