no its not reason.
frequency and colour of loos stool is not that much important.
Important thing is Dehydration
(low urine out put,sunken eyes, tear less, drowsiness
, less active etc)
Give plenty of water(1/2 liter water+ 4 tsf sugar+ 1/2 tsf salt)
Stop milk product except breast feed should continue.
Take lower antibiotics.
"i wish your child good health"