To sign branches, first make the tree sign with your dominant hand and forearm, then take your non-dominant hand to form one branch (with the index finger only) or several branches (with the open 5 hand). The "branches" themselves are traced in the air with the finger or fingers in a kind of horizontal "S" pattern, going up and down and up again, like a rollercoaster ride.
Children are naturally curious, so they love to explore their surroundings and pick things up that catch their eye as soon as they are able to get around. Teach your baby or toddler the branches sign in the context of seeing these out in the yard, garden, or park, or even just in their picture books at first.
Teach your child this sign when you encounter it in their picture books, or when you are out exploring nature.