Teach your baby the signs for the letters m, n, and o in baby sign language fingerspelling with the following descriptions and videos.
Tuck the pinky under the thumb. Fold the other three fingers over the thumb.
Tuck the pinky and ring fingers under the thumb. Fold the other two fingers over the thumb.
Form an open circle with the fingers and thumb. Note that the sign for zero (0) is identical to the fingerspelling sign for the letter O.
Porpora, Tracey. 2011. The complete guide to baby sign language: 101 trips and tricks every parent needs to know. Ocala, FL: Atlantic Publishing Group, Inc.