Which of the following learning concepts was extensively studied by the person in this photo? 
Definitions:
Painful Contractions
Involuntary muscle contractions that are often intense and can cause discomfort or pain, commonly associated with labor in childbirth.
Small-For-Gestational-Age
A term describing infants whose birth weight or length is significantly lower than the average for their gestational age.
Average Weight
A statistical measure that reflects the central or typical weight of a population or group.
Gestational Age
The age of an embryo or fetus (or newborn infant) starting from the first day of the mother's last menstrual period, typically used to predict birth date and assess developmental milestones.
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