4 months old baby diarrhea. Like this!

My baby has diarrhea for more than 2 weeks when we checked with pediatrician 2 weeks before told to give z and d for 2 weeks , mahacef 2 times for 6 days and econorm sachet for 4 days half one time after started medicine baby strated recovering well and still I am giving z and drops alone but felt again going watery loose motion on past two days for 4 to 5 times and stopped all the medicines now  but baby is active and taking formula milk as unable to give breastfed since born and we started given solid food noon time daily for past one month, when I was checked doc said takes time for loose motion to get recover when baby is active nothing to bother, please suggest is this normal or do I need to concern about it as going watery loose motion for more than 5 times, earlier they didn't went like this and how long is this been like this