To sign doctor, take your strong hand, curve it, and touch it to the inner wrist of your non-dominant hand, like you are taking a pulse. An alternative ASL sign for doctor is to form a letter 'D' with your dominant hand, then touch it to the inner wrist of your non-dominant hand.
Rarely, doctor is mistaken for again, because of the same curved, dominant hand touching the non-dominant hand. The important distinction is, while you touch your inner wrist with the dominant hand for doctor, you touch the inside of your palm with your curved hand for again.
Introduce your baby to your pediatrician with the doctor sign. Most pediatricians know a bit of Baby Sign Language (or are keen to learn) and are happy to make the sign back.
We love to teach this sign to reduce anxiety associated with doctor’s visits. We want our babies to perceive the pediatrician as their friend.