Four Months Old and Baby Signing
When my son was only four months old I wanted to know if he was still hungry when he finished his food or bottle.
So i would make more ask him "more?", show him the sign and hold more in front of him.
I don't really know how he caught on but by the end of his fourth month he could show me more anytime he was still hungry and now applies it to more of anything that he wants.
I love signing with my son.