Does rice cerelac cause loose motion?

Hello My baby is of 7 months. I started feeding her Cerlac(Rice), a week after she entered 6 Month(after consulting Pediatrician) We have also started giving her Similac Advance Stage 2 from the same time. She was on Similac Advance Stage 1 (1 to 6 months) now that she is of 6 n half months old, we started Stage 2 Since a month, her motion is very watery. It is not very frequent. Three times in 24 hrs and sometimes only once in a day. We have switched back to Similac Advance Stage 1 but the motion is still loose.. I am worried and doubt if Rice cerelac creating a problem. Baby is active and taking feeds normally. I give her cerlac two days in a day but only once I gave cerlac only once in a day but still the motion was watery. So not sure if Similac is causing the problem or cerlac. Is this diarrhea or is it normal?