4 month sleep regression

I thought I'd share with you something I had never heard of. My son was due mid April and I had him the very end of March. He was a super easy baby from the beginning and slept amazingly and never cried. Then all of a sudden about 3 weeks ago he was sobbing and inconsolable until he cried himself to sleep a few times a day. He also went from only waking up once at night to feed to waking up pretty much every 2 hours. I was a wreck. I had no idea what it was and people kept telling me it was gas or teething, but I knew it wasn't. I figured out that he's been going through "sleep regression". Seriously look it up! I wish someone had told me about it as it would've helped me a lot so I hope it helps you. I thought my baby was turning into an asshole.