My Baby Is 18 Moths. She Had A Loose Motion

My baby is 18 moths. She had a loose motion problem for last 5 days and diaper rash but rashes is now cured. But still loose motion problem my doctor suggest cetralon syrup two times daily. We wil plan to travel in flight after ten days so we are worry about her health. But she played well and after drinking milk( nan 3) she passed stool there is no smell frm it. Give me yr suggestion doctor.