Z & D drops is basically zinc and it is safe but it is usually not used beyond 14 days for diarrhoea. Either way, in this age the frequency of stools is not important. What is important to note is that the baby should breastfeed well, pass enough urine and be active. If these things are fine then do not worry and avoid unnecessary medications. The stools will keep varying with growing age.
Next Steps
Stop the drops.
Use dologel mouth ointment at the teething sites to soothe the irritation.
Health Tips
To be sure of the general condition of the baby, always visit your paediatrician and dont rely only on messaging and phone calls.