Is your baby sleeping through the night?

Oh my I’m one tired momma! My daughter started sleeping 6 hour stretches before she hit 4 months then suddenly stopped and is waking up constantly. I’ve tried bathing her before bed, zen sack, bought a new crib mattress, and nope. She always ends up in our bed and although sometimes still seems restless will sleep much better with me. Is this normal? Should I still be feeding her throughout the night?