I have a teether

Eliza has her 2 bottom teeth coming in. I know how often I have said how fast my children are growing. Eliza seems to be on fast forward. As I do feel she may be my last, I had been hoping she would be slower, but instead she is reaching milestones faster than my other 2 who were both at the front end anyway. She just turned 4 months old and has 2 teeth broken through and is rolling. She just in the last few days will roll from front to back and then to front again. Why???? I love her to death and I want her to stay a baby. She already doesn't really seem like a baby. She is wearing 6-9 months clothes. I just feel like crying!