First words already???

A few days ago (4 months and 1 day) runt said what sounded like "mama" numerous times. Since then, we have been trying to get her to do it again, but she won't do anything if she has your attention. Its only when you are distracted that she calls. So, my husband and I sat in front of her on our phones (with the camera on so we could see her without her knowing) and she said it! At least 5 times! My runt not only signed mama first, but spoke it as well! I'm super excited she said mama first, but I'm even more excited that she is so smart.
My only problem? This kid is growing up too fast! She is over the 100th percentile for her height, 97th percentile for her weight, and bigger than any 6 month old I have met! I both love and hate this. I mean, my kid is awesome! However, I missed out on the little baby. She only stayed that way for 2-3 weeks and now she is constantly on the move or talking. I love all of the things she is learning and I love that she is ahead, but part of me wishes she would slow down!!! Its worth it, but geez....