The ASL sign for “son” combines two simpler signs, “boy” and “baby,” into one fluid motion. Your dominant hand touches your forehead and then moves down to rest on your opposite forearm. The whole thing takes about one second once you get the hang of it.
The Two Parts of the Sign
“Son” is what linguists call a compound sign. It merges “boy” (or “male”) with “baby” into a single, shortened movement. Here’s how each part works:
- Part one (boy/male): With your dominant hand flat, fingers together and thumb slightly out (a “B” hand or flat-O shape), touch the edge of your fingertips to your forehead near your temple. This looks a bit like a quick salute. It represents the “male” half of the sign.
- Part two (baby): From your forehead, move your dominant hand downward in a small arc and land it gently on your non-dominant forearm, which should be held horizontally in front of your body with the palm facing up. This represents the “baby” portion of the sign.
Because it’s a compound sign, both parts are abbreviated. The forehead touch is brief, and the arc down to your forearm is smooth and quick. You don’t pause between the two movements.
The Most Common Mistake to Avoid
When people learn the sign for “baby” on its own, they’re taught to rock their arms like they’re cradling an infant. Do not rock your arms when signing “son.” The baby portion of this compound is reduced, meaning the rocking motion is dropped entirely. Your non-dominant arm stays still while your dominant hand simply comes to rest on it. The same rule applies to “daughter.” Adding the rocking motion would make the sign look like two separate words rather than one.
Why the Forehead Matters
ASL has a built-in spatial system for indicating gender. Signs associated with males (boy, dad, brother, uncle, grandfather) are placed near the forehead. Signs associated with females (girl, mom, sister, aunt, grandmother) are placed near the chin. So when you touch your forehead at the start of “son,” you’re signaling “male.” If you were signing “daughter” instead, you’d start at your chin and then arc down to your forearm in the same way.
This forehead-versus-chin pattern is one of the most consistent rules in ASL, and once you know it, you can often guess whether a family-related sign refers to a male or female relative just by watching where the hand lands on the face.
Putting It All Together
Stand or sit comfortably. Hold your non-dominant arm horizontally across your midsection, palm facing up, as if you were about to cradle something. With your dominant hand flat, touch your fingertips to your forehead. Then sweep your hand down in a short arc and place it on your non-dominant forearm, palm down. Keep the whole motion smooth and connected, one beat at the forehead and one beat at the arm, no pause in between and no rocking.
Practice it slowly at first, then speed up. In natural conversation, the sign is quick and relaxed. The forehead contact might become just a light brush, and the arc might shrink. That’s normal. Compound signs in ASL naturally compress over time, the same way English speakers turn “going to” into “gonna.” As long as the two contact points (forehead, then forearm) are clear, you’ll be understood.