At 4 months, Sarah:
Can:
Roll from tummy to back (but not from her tummy)
spin around while on her tummy.
chat and coo.
Smile and smile and smile
start to grab and swipe at toys and mobiles
Likes:
watching Casey play
mommy and me yoga
being held facing out and making mom do squats up and down
swaddles and pacifiers
Dislikes:
staying in the stroller for all of stroller strides
6-7pm, fussy hour!