I also stop bfding too. Didn't have enough milk. So instead on total formula milk now. Yes, drink more water in between feeds help a lot. As long as his poo don't look hard, sure no problem. My baby poo also don't look hard. And I give her water every 2 hrs or so. My baby didn't poo one day, the nurse says is fine. I think if he doesn't poo for a week then may need to see dr. If 1 or 2 days should be fine. My baby is drinking Enfalac A+ so far her poo is fine, no constipation, so u may want to consider trying that.