Could my 9 week old have a lactose problem? she spits up quit a bit & we have been putting rice cereal in her bottles, but not much change.

Yes: Could be lactose intolerance or esophageal reflux(gerd), defer to your pediatrician.

Reflux common : These symptoms may be related to reflux, feeding her at an angle of 45 degrees and raising the head of the bed is usually helpful. She may need medication to control the reflux if her growth is affected or there are other complications of the reflux. Reflux is quite common at this age, and tends to improve with age. Lact intol usually presents with symptoms of spit ups and loose stools.