The subject is controversial and different groups have made different recommendations for different reasons. All will agree however, if you're going to have it done - the newborn period is the easiest. There are several treatments that depend upon accurate diagnosis. Yes, she is. If she has been evaluated by your physician and he is sure that no infection is present then chronic constipation may be due to decreased bowel control.
Most physicians recommend a three step plan for treatment.
1. empty the bowel . This can be done with laxatives or enemas. Keep the bowel clean. This is usually done with mineral oil giving a dose dependent upon her age and size twice daily. Retrain the bowel by having her sit on the toilet after meals for 10 minutes.