The Baby had his seven month follow-up weight check yesterday. For those of you following along, at six months he only weighed 13 lbs 11 oz and was below the bottom of the weight chart's percentiles and he'd only gained 11 oz in two months. The doctor wanted us to make sure he got more calories and suggested supplementing with formula.
The formula was not well received in liquid form, but after a few days of trying he was willing to eat it mixed with cereal and I started feeding him solids at least three times per day and making sure I nursed him more often and longer.
After a month of gorging, he's up to 15 lbs 2 oz, which, while by no means a big baby (that puts him in the third percentile for weight), is a rapid increase back up to his personal normal curve. We're happy and so is the doctor. Now we just need to keep it up and make sure he keeps eating enough.