Sleeping through the night

Hi,

My daughter just turned 6 months. She's been sleeping in her crib since 4 months old day and night no problem, but we can't seem to get her to sleep through the night.

She usually wakes up 2 times at night, and relying on feeding to fall back to sleep. I have not tried to let her cry it out, I sometimes can't tell if she is hungry or just needs comforting, but when my husband goes to comfort her, it usually just make her cry even more, it seems only feeding can