3 month old baby on breast feed, also bottle feeding. Weight gain appropriate for age 5.9 kg. Birth weight 3.2 kg. Immunized up to date with IPV, Pentavalent, Rotaviral vaccines.

Normal mile stone, uneventful upto date. Had fever loose stool in 40 days of life, recovered. Now mostly passing greenish yellow or green pastures stools. How to proceed?