It is now known, that circumcised infants do not forget the pain during circumcision easily, as a correlation between circumcision and intensity of pain response during vaccination months later could be established. Studies indicate that mother-child bonding and breast feeding may be adversely affected by newborn circumcision. [19]
quoted from wiki the citation is here.
HTTP 429A stressful, painful event such as circumcision affects feeding patterns. Infants feed less frequently and are less available for interaction after circumcision. Observed deterioration of breastfeeding after circumcision may potentially contribute to breast-feeding failure and changes in mother-infant interaction.
”Howard CR, Howard FM, Weitzman ML. Acetominophen Analgesia in Neonatal Circumcision: The Effect on Pain. Pediatrics, 1994; 93:641-646. [Full text]
”Dixon S. Snyder J. Holve R. Bromberger P. Behavioral effects of circumcision with and without anesthesia. J Dev Behav Peds 1984; 5: 246-250. [Full Text]
”Marshall RE, Porter FL, Rogers AG, et al. Circumcision: II effects upon mother-infant interaction. Early Hum Dev 1982; 7:367-374 [Full text]
and the pain vaccination stuff.
Effect of Neonatal Circumcision on Pain Responses During
Vaccination in Boys
Using data from one of our randomised trials, we investigated post-hoc whether male neonatal circumcision is associated with a greater pain response to routine vaccination at 4 or 6 months. Pain response during routine vaccination with diphtheria-pertussis-tetanus (DPT) alone or DPT followed by Haemophilus influenzae type b conjugate was scored blind. 42 boys received DPT and 18 also received HIB. After DPT, median visual analogue scores by an observer were higher in the circumcised group (40) vs 26 mm, p=0.02) After HIB, circumcised infants had higher behavior pain scores. (8 vs 6, p=0.01) and cried longer 53 vs 19 s, p=0.020. Thus neonatal circumcision may affect pain response several months after the event.
increased pain response is a symptom of memory.