DS has been exc bf until now and he's nearly 6 months. I am going back to work in a few weeks so am beginning to stop bf. The thing is I'm not sure how much to give him. I always bf on demand and DS fed roughly every 2 hours sometimes more frequently. And he still wants to feed every 2 hours with formula. He's had 2 x 180 ml bottles in the last 3 hours. I'm assuming I should just feed on demand like with bf but can I overfeed him?