Ds2 is 8 weeks old. Over the last few days he's cried almost all the time he's awake, settled to sleep with difficulty, fed frequently. His tummy is hard and we can feel the wind. He draws his knees up when crying. Infacol doing nothing. No big poo for three days. Mum thinks he's constipated and wants to give cooled boiled water. I'd have done so with Dd 8 years ago but have heard we no longer should. Why? Any other suggestions please?