Bentley is now 4 months old...how did that happen??

At 4 months Bentley has really started to interact with her surroundings.  She reaches out to her toys, grabs her feet, smiles, laughs, she has rolled over once...i think it scared her too much to try it again.  She has really strong legs to the point that while lying on her stomach she will push so hard with her legs that her face gets buried in the blanket because her arms aren't strong enough to support her torso.  After a few minutes I have to turn her over because her face starts to get blanket burn (relative to carpet burn).
Here are some pictures from her mock photo shoot.