My daughter was born on 1-14-11.  During one of her initial doctors visits her head circumferance was measured in the 42%.  Today she is 7 weeks old and her head was measured only at 23%.  Her doctor never said anything about it but should I be concerned in the drop? I know the measurment has to do with her brain development.
If the head circumference is lower than the normal lower limit that it is the matter of concern. This may b due to abnormal brain development or other sum Chat Doctor.  So u should talk with your doctor to explain u the situation.