My Baby Is 3 Months 32 Days Old. He Is

My baby is 3 months 32 days old. He is not passing motion regularly. I was advised to give duplac 3ml. I gave duplac 3ml for 2 days, the third day I increased the dosage to 4ml. It's been 6 days of using duplac. But baby has not yet passed motion. Please advise.