It was explained to me when dd was like this that it's not unusual for them to not go often as their body is actually using everything that goes in, so there isn't much waste to get rid of. As her good intake increases it may become a drama if she's not going more regularly, but dd was over ten months and still only going every ten days or so. Around her first birthday, she started going daily again. E was a bsl babe so I don't know exactly how much was going in but I know a fair bit was