Even with the reduced amount at night, you may notice your baby isn't interested in drinking extra milk the next day. If that's the case, don't force it. He might not even have been hungry when he was waking in the middle of the night and was only feeding as a habit. Maybe he doesn't need as many calories now that his body isn't growing as it once did as a newborn. Or he could be in that stage where he's more interested in exploring and practicing his skills than he is in eating. Feed him in a "boring" room with little distraction or in a new environment where he doesn't notice he's finishing his bottle. And the best way to make sure all is fine is to check with your pediatrician about his weight gain. She'll let you know whether there is an issue at hand.