What is the period of constipation? If it is from birth, for long period, we need to do further investigations. If for short period,  we need to increase water intake,  fibre intake in form of leafy vegetables, fruits, reduce intake of milk.If no improvement, we need laxatives

You can give a laxative Luke junior cipeg powder 1spoon mixed in 30-50 ml water once a day in the night for 7-10 days, Meanwhile restrict giving cows milk and continue breast feeds as it makes stools softer,encourage giving more green leafy veggies,fibrous vegetables and fruits and more solid diet throughout the day with more fluids.

Syp Duphalac 5ml hs once per day x 5 days