At my sons 4 month well visit check the doctor said we didnt need to necessarily start baby food but can if we want to. But then she said "you know if he wants some of your potatoes at dinner that's fine" ....really? Potatoes? I have never heard this before in my life. Was this just a really bad example?

Also, my son is eating a lot around 40 ounces of formula a day. She advised to try water (up to 4 ounces) a day? I thought water wasn't introduced until 6 months?