what do you mean by "fear of circumcision ceases within 10 days"? As far as I know, circumcision results in short-(and perhaps long-)term changes in the HPA system, for instance cortisol.
Newborn males respond to circumcision with a marked reduction in oxygena- tion during the procedure, a cortisol surge, decreased wakefulness, increased vagal tone, and less interaction with their environment following the procedure
There is a 50% increase over the baseline in heart rate in males undergoing the procedure and an increase in level of blood cortisol by a factor of three or more times has been recorded
serum cortisol levels increased sharply immediately following infant circumcision and remained elevated for sev- eral days