Lessons learned while photographing a 6 month old

Pick props wisely (watch out for a lot of white, which can easily be over blown)

Use a diaper cover ;-)  Dispo diaps just aren't attractive to photograph.

If they can't sit up consistently yet, put a pillow behind them so they don't bonk their heads ;-)

Frame the picture wide so as to not cut off limbs... and get a new perspective by putting the camera low.