My baby is 12 weeks old tomorrow. He is eating 40 ounces a day! He had trouble latching because of a recessed chin so I was exclusively pumping. But I only pump 32 ounces a day so I've been supplementing with formula now that he is eating so much.  He is in 99th percentile for height and head size and pediatrician said its just a growth spurt, but it's been more than a week now.  I can't believe how much he is eating.  Anyone have a similar situation or advice?