Is this the dreaded Sleep Regression?

My son will be 4 months on Tuesday. Nearly this entire week, my son has been sleeping horribly. He wakes up nearly every 2 hours to eat including at night, his morning nap went from 3 hours to 30 minutes and when he wakes up in the middle of a nap it takes longer to get him back to sleep since he wakes up and seems ready to play again.