I wonder how educated people like you do not follow the norm. It's been repeatedly broadcast on TV, Radio and in newspapers and hoardings that every mother should give exclusive breast feed to their babies till 6 month of age. the bay should not receive other things apart from breast feed (not even water) till 6 months of age. Formula feeds have many disadvantages.
Now coming to your question.. Weaning means to start with normal feeds apart from mothers milk. Start with boiled and mashed rice, potato, carrot etc (any vegetable) with little salt. you can add cerelac starting from no.1. avoid milk as only diet as it is the main cause of constipation
. You can give freshly prepared juice (orange or apple), it also combat constipation. it's good that you are giving your baby a lot of water. it will take 2-3 week after changing this diet plan
to get normal stool pattern.
i want to ask you whether there was constipation since birth or he developed it after 6 months? do contact me for future follow up. Best wishes.