6 month old not sleeping..

Help!! my 6 month old girl is still not sleeping at night... if anything she's gotten worse at it where she now wakes every 1-2 hours... we have a bedtime routine ( bath, jammies, bottle ) and she goes to sleep no problem but she's awake again in no time.. she will take a bottle when she wakes and goes back to sleep but she really can't be that hungry all night can she? She's on formula and solids now getting 3 meals a day. How can I get her to sleep for longer stretches???