Thanks for your query.
Whenever there is change in food ,there is change in stools frequency and consistency.
Weaning is ideally started after 6 months of age.
To start with is fluids which include boiled rice water,boiled pulses water.
Different things are introduced one at a time in small quantity.
After a month semi solids are introduced.
I suggest you to continue with darolac for 2 to 3 days.and zinc for 14 days.
In case symptoms persist get him evaluated by pediatrician
Wishing your baby good health.