5 1/2 hours!

Shanna • Huge family.
I just woke up to feed my little one as he started to get fussy. He is 2 months old and usually does one 4 hour stretch each night of sleep... But I looked over at the clock and discovered, he had slept for 5 1/2 hours! I'm feeling kinda guilty right now. Isn't he too young to be sleeping that long at night?