Sleeping question

Joanna

My 14 week old will sleep from about 8 to 2 and I'll feed her when she wakes at 2 and put her back down. But after that feed she will only sleep for 45 min before waking up again. I'll bounce her back to sleep and then she's back up again 45 min later. We go through this cycle until she's hungry again at 6:30. I'm not sure how to help her sleep better that second half of the night. FYI We swaddle and white noise in bassinet next to our bed.