First of all All these  problems are  bcz of  Less  fiber in diet Give him  plenty of oral liquids  all types of liquids Fruit juices Green vegetables in diet Don't give  a lots of  maida products Keep simple diet  for him For  now Just give Syrp. Eva Q 3.5 ml twice a day  for  3days Don't use it  continuously.

Give Syp.lactulose 5 ml.thrice aday Add plenty of fluids and fibres in diet