He sleeps all night..... already!!

Gi
He sleeps all night now and he's only 3 months old!! Wow. He'll wake up maybe once (like us regular human beings)and we'll just reswaddle him and he goes back to sleep. He'll go almost 12 hours between the last feeding and first feeding of the day! I've heard of babies sleeping all night like at 6 months. When did yours start sleeping all night?