Use appropriate vocabulary: Use the correct anatomical terminology instead of pet names when referring to different parts of the body. Not only does this educate your child, but it also teaches her not to be ashamed of any part of her body.
Praise the entire package: Even if your child is the cutest little thing you've ever seen, make sure that you aren't just complimenting her on how cute she is. Your daughter needs to learn from a young age that she isn't just a pretty little girl but that she's also smart, brave, and strong. By diversifying your praise beyond physical attributes, you will show her that these qualities are of even more value than appearances.
Embrace her observations: At this age, kids can so the darnedest things, but don't set the precedent that certain physical attributes are bad or should be ashamed of. If she points out your tummy or stretch marks, use this as an opportunity to teach her how proud you are of your body instead of telling her that it isn't nice to comment on the size of someone's belly. By keeping a neutral or educational response and embracing her thoughts or questions, she won't start thinking that certain body types are better than others.