Is he screaming/fussing/arching during these times at all? Seemingly uncomfortable?? Ds 2 got progressively worse and I knew he had reflux but when he started only sleeping 20 mins every hr @ 9 months I knew there where food allergies- which where confirmed at 11 months. It may not be that; but if you feel that it's not the "normal" sleep regression; go with your instincts. Are you nursing/ have you possibly started solids recently?
mama to three sweet, rough & tumble boys who always keep me on my feet: