Alex's first word

For a couple of weeks now Alex has been saying, "mamamamama" while she cries. At first I wasn't certain that's what she was saying but I sure am now. My husband especially was uncertain but even he believes now after hearing her cry in bed the other morning.
It's only when she cries, as if she's calling out for me to help her. Sometimes it sounds like, "mom, mom, mom."
Next we have to teach her, "dadadadada," I worked very hard at teaching her mama. I can't believe my 4-month-old can talk AND has two teeth.