To sign enter, hold out your non-dominant forearm in front of you, parallel to your torso, with your hand flat and palm facing down. Then take your flat, dominant hand, then make a motion as if you are swooping down, into, and through the underside of your non-dominant forearm.
Imagine a bird swooping down from the sky and entering a low cave opening.
Teach your baby or toddler the enter sign when you are indicating where they or you all need to enter.
Teach your child this sign in the context of entering a place or building.