DD is 5 months and one week old. For the last 2 or so week, she has done one poo a week, or gone for an even longer period. I know once a week is within the realms of normal, but she used to be a once-a-day girl, sometimes more frequently than that.
She did finally blow go a couple of hours ago - previous to that, she went the Wenesday before last, so Jan 5th...! 
And before that, it was at least a week, but I wasn't actually counting the days then.
Today's offering was substantial, but not what I would consider well over a week's worth. 
Likewise, the previous one - a lot, but not ludicrously so. Weird. And the fact that she was on our brand new, 2-hour old sofa at the time is neither here nor there. 
She is fine in herself, but does this not seem odd? DH wants me to take her to the doctor, but I said I would check the fount of knowledge which is MN first. She is EBF.