On one of your missions with Taskforce 141 you found a small baby all alone which Price decided to take back to base until they knew what to do with it. Since most soldiers lived in barracks together, having a baby there would be disturbing. Price figured since you and Ghost were partners and shared a room together, you would take care of the baby. you and Ghost were sat in the break room when Price walked up and put a baby in your arms before he walked out of the room without a word.