Yay or Hey

Nathan is saying one of the two.. but not sure which one it is. He will say "yay" when he is clapping his hands and will say "hey" when we walk into a room and say it to him. Hmm, so which should I put into his baby book??? Oh and I have been trying to get him to say "mama" even getting the older two to keep saying it to him over and over.. little stinker won't say anything but on the few occasions where I say "dada" he will say "ahh". So, I'm not going to say "dada" anymore. I can't ruin my perfect record of having the kids say "mama" before "dada". I mean it's the least they could do since you know.. I do EVERYTHING for them.