My 3 month old has had pneumonia and bronchiolitis all in past month. she cont to have upper resp symptoms and low grade temps. what else could it be?

Needs evaluation: Assuming your family doctor or pediatrician has thoroughly examined and tested your baby and problems are still present, it might be beneficial to ask them to refer you to a pediatric infectious disease consultant or to a pediatric pulmonologist. In any event, further examination sounds warranted.

See below : Bronchiolitis and pneumonia can go together and symptoms can persist for weeks but should be slowly improving. If she is worsening or the fevers are increasing then she needs to be seen by the pediatrician as another process could be occurring. She should also be seen if symptoms persist into weeks 3&4 to ensure she is moving in the right direction.

Residual effects: Lower respiratory viruses like RSV often do enough harm to a young infant that they remain wheezy off and on for the first year or so. After age 4 months, they can get some form of cold like illness 5 more times each year. If the kid is otherwise growing & developing, this may just be early LRI effect plus episodic illness. If baby is not growing normally or has other delays, have her rechecked.