My baby is 4months & 22days old to be exact. Weight 5.8kg and she fully breastfeeds...

Is it normal for her to poo several times a day, like 5 times a day..

Is this new for her, or has it been fairly common? At 4 months, bowel movements of breastfed babies can be frequent... several a day, or spaced out... none for several days. If the consistency is normal for her, still mostly the mustardy yellow and not really formed, then it is normal. Frequent, very loose, runny bowel movements could be diarrhea. Gaining weight, alert, content, bowel movements normal in appearance, usual urination, all is usually well.

When in doubt, you can always check with her doctor.