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.
They can remain on your report for 7 years from date paid off UNLESS you negotiate a Pay Per Delete agreement with them. They agree in writing that they'll delete the account from your credit report once paid in full.