To sign good, take your flat, open dominant hand with fingers together, and starting from your chin, move your hand in a downward arc. You may also have your flat non-dominant hand, palm facing up, to act as a support for your dominant hand. When you sign good without the resting palm, it looks like the ASL sign for thank you.
The sign for good looks like you are blowing out a kiss, but your hand arcs down a bit lower.
Use good with things that your baby enjoys, particularly food. When your baby is visually pleased by an experience, use the good sign. When you say emotional signs like good, use a rising inflection to help communicate the meaning to your baby.
Adjectives or descriptors are a great way to help babies express complex emotions. Knowing the concept of good also helps with self-esteem.