Re: Not eating or drinking-help!
At this point, as long as you are nursing at least 3-5 times a day, your LO will get his daily requirements met at the breast, without you needing to feed him additional diary (animal milk, yogurt, cheese, etc.). Obviously, more nursing is better, so if you're nursing at the higher end of the frequency spectrum, Yahtzee!
At this stage, solids are becoming an increasingly important part of your baby's diet. But babies are able to get all their nutritional needs met by breastmilk (or formula) alone until around the first birthday, after which the transition to a majority solids diet is slow, with many babies remaining predominantly but not exclusively reliant on breastmilk until sometime in their second year. My kids, for example, barely touched solids until around 14-15 months.
If your pediatrician pressures you, you can fall back on "we're working on it and he's getting more interested in solids every day." It's a little white lie that will keep the pediatrician off your back.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"