If disaster should befall the larger chick the parent can switch to feeding the youngest and it will exhibit a constant growth curve from the day of active feeding. From Wikipedia
Simply send them a letter (with proof of delivery) using the contact information found on your credit report. Generally they have 30 days to investigate and get back to you, or the information must be removed.
I meant to add also that 7 years from your DFD date, it will fall off of your credit report. Paying a collection in full does not restart this date; it will only bring the collection's activity date current which can sometimes hurt your score. Paid off debt always looks better to manual reviews/reconsiderations for lines of credit.