I always say go with your gut instincts. For example, my son's pediatrician told me no solid foods before 4 months, but my son was eating every hour and screaming in hunger after every feeding at 2 months. I would give him formula until he spit a lot of it up and still he would scream in hunger even though his belly was full. I finally broke down and gave him rice cereal mixed with formula against doctor's recommendation, and I didn't feel guilty about it. It satisfied his hunger and he suffered no ill effects from it.