FYI, I had Silvie on Parents Choice for Gas and Fussiness (comp. to Enfamil.) Took her to the ped because she wasn't pooping without help (lax. or stimulation) was eating significantly less, and was pretty cranky. Ped said the gas and fussiness formulas actually tend to bind them up, so I should switch to traditional Similac Advance (blue) and its worked wonders! I have my happy baby back and she's eating 5 oz again and pooping on her own! Yay!