Why is that not enough milk? By my calculations, he's getting about 28 ounces, which is totally fine at his age. At his age, my doctor actually recommends though two solids meals and 24-32 ounces. So instead of a lunch solid meal, we give our DD two bottles - one around 11 or 11:30 (usually about 6 ounces) and one around 1 or 1:30 - usually about 4-5 ounces. You may also find him taking more at each bottle when you do drop the DF.