Thank you for your query on Healthcare Magic,
Starting cerelac from 4 months of age is too early.
And I advise you to stop the cerelac and continue exclusive breast feeding till 6months of age.
From 6 months onwards you can start Cerelac in addition to breast milk.
Green stool may be normal as there is no watery stool.
Consult your Pediatrician
for the proper
feeding advise for your child and the treatment of cold
Hope I have answered your query.