Which condition is characterized by a reduced rate of head growth beginning in the toddler years?
Select one:
a. Down syndrome
b. Prader–Willi syndrome
c. Wiedemann–Beckwith syndrome
d. cerebral palsy
e. Rett syndrome
Answer:-(e) Rett syndrome
Explanation:- For Rett syndrome, a decreasing rate of head growth is used as an essential diagnostic symptom for the disorder. In Rett syndrome , children have normal head circumference at birth , followed by a slowing of the rate of the growth, this period of slowing can begin between age 3 months and age 4 years. In girls , head growth get decelerated by less than 1 SD score in 20% of the girls at the age of 6years and in 10% at the age of 12years.
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