Hi, Yesterday my 4 months old son who's on top feed(Nan Pro 1) strained while passing stool and cried. Stool was slightly hard in consistency. I had to help him pass stool. Since the day he's on formula feed, he has been passing stool only once a week. Earlier when I expressed milk and gave that time he used to pass stool every day which was mustard yellow in color but now he passes greyish green stool. People told me that while using Nan Pro for their kids,they faced the similar problems. I took all the precautions but still. I was giving him xymex drops everyday but it's used in diarrhoea as well. Could that be the reason of my son passing hard stoo( not like pebbles). Please tell me what can I do to avoid constipation. He is been fed forcefully every day, I try to feed him when he's asleep otherwise he doesn't drink at all. I'm thinking to give him some amount of water every day in order to avoid constipation. please help. There's still 2 more months in weaning.